With a firmware update, works very well.
587848
After a little hassle, it worked. It connects up and works fine with an Actiontec 500MB HomePlug sender, extending my WiFi network to a part of the house it didn't reach before.

As received, it did not work -- the WiFi portion was inoperable. However, the HomePlug and wired eithernet worked, so I was able to connect to its web-based management console. Following advice from the excellent customer support chat from ZyXEL, I updated the firmware. This was simple, but had to be done one rev at a time. After getting from rev 1 to rev 7 (about five minutes per update), it works with no issues.
225211
I took a chance on this refurb unit and I am glad I did.  I originally had the RT-N56 and a friend told me of this unit that they had.
Two things you need to do:
1. Get the latest firmware immediately.  My units firmware was up to date so I was pleasantly surprised.
2. Change the DHCP setting from aggressive to normal.  Some cable companies will throttle your speed if you have services like Netflix and DHCP is set to aggressive.  It is under WAN settings at the bottom labeled Special Requirement from ISP   I can understand where some users believe the router is defective when it is actually the cable company throttling their speed.

Packaging was good and you could tell it had been opened previously, but everything was there and nothing broken.  The unit itself looked new and had no scratches.
762823
Works very well, combines a few tools I carried separately.  Love the inrush current measurement.  From earlier reviews they seem to have fixed the firmware lockup problem, couldn't induce the same problem in mine.
3622125
I flashed this with the firmware available at aredn.org for amateur radio use.  It serves as a router supplying Internet access to my various mesh network nodes.

In this role, it performs quite admirably.  I can receive signal from at least half a mile away.  It plays well with my neighborhood's amateur radio mesh network.
3548789
Works great. Be sure to do a firmware update though. Only thing I don't like is that the main camera uses a suction cup to stick to your window. Every once in a while you'll come out to your car with the dash cam just hanging there because the suction cup fails.
4945896
There was one small issue that was handled well by customer service. The device that arrived needed it's firmware updated in order to work. The set up took me 15 minutes but then 2 hours later it crashed. Everything I knew to do wasn't working so I called customer service at Linksys. The woman I spoke to was well informed and helped me reinstate my device. Since then it is working extremely well. My Wifi is once again secure.
3651852
Plugged it in and updated the firmware to version 2.7 via ethernet connection and man this thing works wonders. Upconversion is excellent and HD DVD playback is superb.

The unit and the remote control are also built like tanks! Those who own an XA2 know exactly what I mean.
176439
It was easy to setup and work right away.  I did have some problems with connectivity but some searching found that a firmware update was needed. Once I did that, problem solved. Make sure you get your firmware updated!
2714669
Still using with stock firmware..do time for DD-WRT yet..but still seems great!
lighting speed of 5G and great range as well.
been used about month now and just one drop after I plugged in my usb passport drive, dunno why.
I will try to install DD-WRT soon, let see what happen after
1603909
I'm using this as an additional access point (AP mode), and the coverage is phenomenal. The latest update does not allow flashing alternate firmware, so beware those that want DD-WRT, Asus Marlin, or Tomato. I had hoped to install custom firmware and use this as my router, but the lack of custom updates leaves me with a sour taste in my mouth. I'll be replacing my current router with one advertised to support open source firmware. That said, this router works wonderfully, and has great coverage.
3728476
this product needed some updates to run properly...it would disable its connection with the router spontaneously, but now that the updates are done it works great. Now I just need to figure out how to get the fios modem/router to work properly without restarting it once a day
2530458
So far so good.  I would recommend more detailed instruction for people who may not be technically savvy hen it comes to updating firmware.
680439
After checking out the reviews of this router (refurbished or not) I knew I could return it. After a firmware update, it has worked awesome. No regrets. I have also purchased a 4TB WD External drive and connected it to the back of the router using the USB 3.0 connection in the back and started loading my favorite movies. No hiccups yet, keep the fingers crossed.
2548725
Once you get this router up and running, it works flawlessly. However, you will have problems with sustaining TCP connections until you upgrade the firmware. i.e., your AIM will periodically shut off, a download will suddenly stop, or an online game will lose connectivity (for just a moment, but this is enough to tick you off). Also of importance is that a wireless connection will sometimes be unable to contact the router once you take it off sleep mode. Note, however, that once you upgrade the firmware (which is really easy to do on the Linksys website), it works great. But the firmware version 4 works terribly.
4527967
It works pretty well, some effects are not useful at all. You aren't going to find something that can do all the similar effects in a device this nice looking.

Didn't need to update the firmware, but I did anyway and doing so was easy.
1938930
Got my unit in the mail a few days ago and hooked it to my TV. The unit came with the firmware already updated to the latest official version which seemed work work stable and reliably, but has some bloat-ware and an ugly launcher by default. There are a few alternative firmware versions available - I ended up using the MK908 Finless 1.8 ROM (you can google that) which feels not only faster but also is rooted to allow such wonderful apps like AdFree Android.

The unit itself may be a clone, but is well made and takes the official as well as 3rd party firmwares made for the MK908 just fine. Since this unit was purchased to replace a defective UG802, I already had a powered USB hub, webcam and usb eithernet adapter setup - the MK908 works flawlessly with both the network adapter as well as the camera. The wifi performance seemed quite a bit better than any other stick I've used (MK802, UG802) and the unit does not seem to get very warm in comparison to it's predecessors.

So everything is perfect? Well, there are a few gripes that I have with the unit - first and foremost, the unit only operates and outputs 720p by default. Depending on firmware version, you may be able to upscale to 1080p, but it is just that - an upscaled 720p picture. My plasma happens only to be 720p, hence I don't care but it seems a bit misleading to not support true 1080p out of the box. The Finless firmware seems to offer an option for true 1080p, but I didn't test that.
Another issue I feel is worth mentioning is the fact that while the RK3188 technically supports up to 1.6 Ghz, my unit is clocked at 1.4Ghz max - again, the Finless firmware has some options for faster speeds, but I have some doubt that the small unit would deal with with the added heat of clocking at full speed. Regardless, the actual user experience is great (it feels fast). Finally, the bluetooth reception/range is really rather mediocre - for a device intended to be close to the TV, the range was barely enough for the bluetooth mouse on my sofa (and my living isn't that big).

Overall, still a great value and a clear improvement over previous Android smart-sticks. If you're not afraid of pushing a paper-clip into the reset hole to flash the custom firmware, the unit is a great option as a media center.
882386
Camera installation very easy - actually it's plug n play, no need to do anything. Cams image as expected very clear, especially when watched over hdmi on HD screen.
The only problem was with setting up online viewing, first Samsung's website for viewing no longer exists and they sent me to another dns site, where i couldn't make it work. then i created an account and subscribed to dyndns. First didn't work then i found out that i needed to update the DVRs firmware, and when i did everything worked like a charm - also encountered a problem with firmware update: when i tried to update it automatically from the DVR menu (online update) it failed many times, then i searched for the latest firmware, downloaded it on my desktop and instructed the DVR to update from the file on my desktop and then it worked. i don't know if after firmware update samsung's dns site works because i continued using dyndns. i am using "IPOLIS mobile" app for my Iphone and Ipad and it's working fine but i am still having difficulties with smartviewer for pc.
Conclusion: good product for this price, good image and sound quality from the cams, but must have some networking knowledge to set up online viewing.