Dessign is not for everybody, one hardware issue.
348674
This product was just not for me.  I found the top mounted ball too large to use.  I often had trouble clicking on what I need as it was hard to move the ball and hit one of the buttons at the same time without moving the cursor.  I have average sized hands; I might only use this for large hands. The base is too large to make use of it on my couch.  If it sits in one spot that is ok, but between the large base and the gravity-held ball, this device is not really portable if I move around on my couch.

The build quality is nice.  The ball feels smooth and durable.  Grit can get on the ball and be noticeable on the glides the ball sits, but it is easy to clean with any soft cloth or the cotton t-shirt you are wearing by taking the ball out.

The software lets you switch which buttons do what, except for the main 'left click' button placed under the thumb.  The ability to change buttons is nice, but the quadrilateral placement of the buttons take some getting used to if you are switching from the traditional finger placement of mouse buttons.

I did have occasional problems with the included RF receiver dongle disconnecting, where I had to physically replug the receiver back into the USB port.  This is not optimal if my entertainment PC is on the other side of the room.

I have not tried the bluetooth connectivity.
321145
The hardware functionality itself is good. What brings it down is a common fault in TV Cards - the mounting is not very secure, and if it jiggles even slightly, it will crash your computer. This means you have to be very careful when connecting and removing video sources. Luckily I have an easy-to-access computer case, so it's not too much hassle to pop it open and readjust the port sitting when it's causing problems, but this might be a deal-breaker for those with screws or bolts holding the case together.
1587421
This was pretty easy to set up and looks good enough (although a little thin, I echo the other poster who said the thinness made it look a little cheap).  My problem was that a lot of my photos had to be re-formatted to be displayed on the frame.  If your file size is over 4000 pixels in either direction it's too big, and you will just get a black screen with the "no" symbol (red crossed out circle).  I didn't realize this until after I had loaded up a bunch of pictures on the chip.  So heads up, if you have any pictures taken with a DSLR you will need to shrink them to a max of 4000 pixels.
1892186
I purchased the 1640SU scanner for our office.  We use the scanner on our "image cneter" computer which is shared by everyone in the office.
The hardware works well: the image and color quality is superb, and the scanning speed is pretty good.  The TWAIN driver and control works well, and there's a simple "auto mode" for people who want to scan their documents without worrying about scanner settings.
Because our "image center" computer has only USB expansion (no PCI slots), we cannot use a SCSI interface that would speed up scanning tremendously.  This has the unfortunate side-effect of seriously slowing down scanning at the highest resolution when the scanner has to temporarily stop scanning while waiting for data transfer to complete.  This leads to a "back hitching" of the scan head which slows things down considerably.
As I mentioned, this scanner is installed on a shared computer.  Unfortunately, there is a really bad bug with the Epson Smart Panel software when installed on a networked Windows 2000 system.  When this software is installed, it prevents people from logging in and using the computer -- it repeatedly throws an error dialog box that won't go away.  We had to uninstall the program.  That's too bad, because if the ESP program worked, it would have made the scanner even more useful and easy-to-use -- the ESP software allows you to assign a preferred scanning software to the push-to-scan button built into the scanner.
The big problem with the Epson scanner is the awful technical support.  Epson's web site is practically useless for technical support; and their non-toll-free telephone-support line, while cheerful, was useless.  With our problem with the ESP software, Epson would not support the software; instead, they referred me to NewSoftInc (who wrote the software for Epson).  NewSoftInc's web site is even less helpful, and I've not been able to get technical support, even after waiting on the phone for 25 minutes!
Overall, this is a good scanner.  I would have given 4 stars, even with the ESP software issues; but given the terrible technical support, I've decided to bump them down to 3 stars.
3753684
Tribesigns is a good seller to buy stuff from... whatever the issue, don't worry, he will help you fix it... Thank you!!!
966407
In theory this is a pretty sophisticated product for a very reasonable price.  Unfortunately, I've had sporadic issues with the software downloading the same transaction twice (with the exact same "Downloaded ID".  Ie., the transaction ID that is downloaded from the financial institution).

Even though the "Downloaded ID" is duplicate, Quicken isn't smart enough to ignore it (see getsatisfaction.com/quickencommunity, topic="Duplicate Transactions with same Download ID").  This makes the product unusable.

Also, for me, there's a vast amount of manual payee categorization required, including fancy categories of a payment in one account counting as a deposit to another account (ie., a bank account payment to a credit card).  This requires a sophisticated user.  Maybe I'm doing something wrong, but I'm an experienced computer guy and it's not obvious.
522552
Overall, I like this product, but there's a couple things that are not so great.  One, as mentioned in a bunch of posts is the weird duplication direction from position 2 towards position 1--not the greatest thing when we're talking a slight mistake can erase you're entire life.  And two, after about 6 months of use, it just stopped showing up on my desktop.  I tried everything, the cord, the connection, the slot it was plugged into.  At the end of the day, it was the duplicator that was the problem.  I'm now about to embark on the return/warranty process to get it fixed.  Hhhhhhuuuuugggg, hopefully that's not too difficult.
968984
I contacted the seller to see if there could be a larger, more readable print....he said NO. Fine...I'll use my softwares and make it in the size I want to myself.
A decent seller would try to accommodate their customers...especially when it's just a friggin digital print anyway.
4858441
The screen does not go horizontal, just vertical, which gets annoying for looking at photos
69098
The system is, overall, robust.  The projected amount of ink savings is huge and well worth it for anyone who prints regularly.  Installation wasn't the most ideal and required some tinkering to get everything just right.  The biggest issue with this unit is securing the ink tube ribbon.  I've had mine fall off several times and it actually damaged the printer (specifically the carriage for the ink heads).  There needs to be a better way to secure this to the printer other than "double sided tape".  I had to use packaging tape to keep the ribbon attached properly.  Even at that I'm figuring out a better way to keep it secured.  I really want to love it for the price, overall aesthetics and cost savings but I can't give it the five stars it should deserve until they come up with a better solution for attachment.
2781068
I was very excited to see this item and eagerly ordered it. On first use I was disappointed. I bought it because I have a large collection of black & white negatives I wanted to digitize. Unfortunately the bracket holding the slides does not hold them flat enough for me, given the natural curvature of negatives, and the device had difficulty getting them in focus. Some shots that I knew to be sharp came out fuzzy. If a piece of glass, or, better, plexiglass, could be worked into the design of the negative holder it might solve this problem. The device worked fine with 4x6 or 3x5 prints but not loose negatives. I tried it with a few color slides, and unfortunately the results were about the same as with the negatives despite the cardboard frame. The unit is made specifically for the iPhone 4 and 4S, and with Apple's recent change of the iPhone dimensions it will not work with these later iPhones. So if you have an iPhone 4 or 4S and need a quick easy way to digitize 3x5 and 4X6 PRINTS this is worth the price, especially since the price is low (and bound to go lower) due to the change in iPhone design.
4120729
Is not able to align each alignment position, the cutting results, and are designed with a large, there should be a mechanical problem
2084242
Display's resolution is great except it is useless.  The font size is so small at its best resolution that it is illegible.

Stuff like that happens when you buy online.

My son put the resolution at less than  the max so that I can read what is on the screen.

I find the feel of the machine somewhat flimsier than my previous one. That could have been influenced by the two narrow hinges that are like the ones of my first Chromebook that caused its demise, unlike the single wide hinge of my second Chromebook that inspires confidence in the physical integrity of the machine.
2937722
The electronics compartment (which has the hanger on it) is not correctly aligned. This means it's impossible, without breaking the clock, to get it to hang correctly aligned vertically. Very frustrating. Very noticeably off center.
2818970
Product requires a custom disk image of one of three distros provided by the seller. You cannot install drivers on an already existing install, so be prepared to start anew in terms of programming and customization if you purchase this screen and intend to use it. Additionally, the touchscreen function is completely inoperable. While this is not an enormous issue, as you can still plug a keyboard and mouse in, the distro I installed did not allow me to resize windows to be small enough to fit on this screen, particularly the raspi-config window which would have allowed me to adjust the resolution. This would not have been an issue, however it would seem that the HDMI port I normally use to program my Pi's is disabled with this screen, as is the default VNC software, making it difficult to adjust anything at all, and as I said it is not a matter of adjusting the settings then installing the screen as the drivers are only available through a pre-configured disk image. The hardware of the screen is very convenient, however, and the only installation it requires is to be placed appropriately over the board once the case has been assembled.

The case is exceptionally good, on the other hand. While it does not allow much room for a heatsink, it is relatively easy to assemble and has good airflow to the board. The case itself is easily worth half the cost of the full product, as there are other more functional 3.5 inch screens that would work much better and might still fit in the enclosure.
4412244
In spite of the fine features of this product, these are things I would like to see corrected:

Among the awesome number of images are some reproductions of botanical prints and fine paintings such as seascapes and still-lifes.  The images cannot be blown up enough for quarter-fold-card fronts without loosing sharpness.

The thumbnail sketch in the "My Projects" screen can have a different name than the image file, which might happen when you rename the thumbnail.  And when you delete any thumbnail, you do not delete its file.

The "My Projects" screen seems a bit glitchy -- it set up two sections for quarter-fold cards and two for posters, interspersed them, and left long blank spaces when I tried to reorganize the screen.  I would like to be able to edit this screen.

When saving projects, I cannot find a way to change the default path to put them in a folder of my preference.

Conclusion:  great program, biggest problem, IMO, is the lack of sharpness of some of the best images.
4176890
I like it enough to buy a second one, but let me just get to the downside.
On a flat surface larger than this piece you will find yourself in a predicament. I attached this to my steady cam and the other to my camera jib. I had to find a way to raise the plate so that the tightening nob would work. The reason it was not working was because the nob was being pressed against the surface of where I mounted it to. The designers did not take this into consideration, even though it would of been fairly easy to fix. Once I raised it by putting some plastic between it and the metal, the nob worked fine.
That design aspect is bad, and I think it should be pointed out. I wish I could give a recommendation for a better solution to the problem, but this is the first quick release plate I have messed with so far.
Its sturdy, and obviously great quality, just keep that in mind as I and others have had problems in that area.