Sturdy, water flow not excellent, defective unit
598043
Unit feels very sturdy, especially in comparison to competition. However, it does not work well.  After initial install, the water flow was smooth and aerated. Flow was not a smooth as the KES version, which is much less expensive, but it was better than any option I found at the local hardware chain, none of which felt as sturdy.  After switching to spray and back, the stream became choppy, no longer smoothly aerated. Further switching did not correct the problem.  Assuming it was defective, I returned it. If this was normal operating mode, I would reduce to 1 star.
997344
The first unit I received but it didn't fit together correctly and leaked terribly. The support was fantastic though and they replaced it vesey quickly. The water quality is fantastic.
4036110
This is tough to review, as it's among the lesser expensive faucets available.  It looks nice, was easy to install, and works fairly well.  It does swing easily and the sprayer works without spewing all over my kitchen.  I spoke to a Plumber about Delta and his opinion was that he's had good success with this brand.  He says their Customer Service department is very good too.

My problem with this faucet, and the one thing that prevents me from giving it 5-stars, is that the handle to adjust hot/cold has a short movement.  It's all too easy to pull the lever up and find yourself getting super hot water or too-cold water coming out.  I wish it had a larger range so that it's easier to get more precise in the hot/cold temp. adjustment.  Similarly, to turn the water off the handle needs to be in a rather precise and narrow position.  I've had to get used to shutting it off properly; if you are off just a fraction the water isn't 'off'.

These may seem trivial and I suppose they are, but Delta could have made an engineering adjustment and I'd give it a 5-star rating.  It's still a 'good' unit, just not a 'great' unit.
2465950
Package came as expected, but one of the accessories was bad. it was leaking water and the plumber told me its not able stop because of that joint which start and stop water flow is bad. SO i have to buy a similar one from home depot which fixed the issue. water quality is pretty good. Water taste really good. SO 3 * for that. Although as whole these water RO system is pretty good , sometime a small critical accessorie can be a headache if not worked properly.
Will love to hear from the manufacturer how they can make sure these  can be prevented for other customers.
2163500
UPDATE:  The replacement I got has worked fine for many months.  The plastic tab at the bottom of the center stem is holding with no problem on this one.  As noted below, the rest is solidly built, and I don't know if it's the kind of plastic or not, but we have 4 cats, and this rarely gets slimy like some do (I know, TMI, but if you're buying this you're a cat person, and they do emit goo). I'm pleased with that, since it makes clean up less frequent and easier. The little pump motor is working well, and the USB cord stays engaged to the wall charger just fine.

OLD REVIEW:
The center stem is held in place by a flimsy plastic tab.  Without that tab the water pressure pushes the stem up and the fountain doesn't work. I returned the first one I got because the tab was stressed and bent (and therefore useless). The second one had the same flimsy tab.  It's not bent this time, so it barely holds the stem in place against the pressure of the water.  The cats like it and the rest of it seems sturdy, but I would not recommend this product.  I've heard of cases where a manufacturer gets good reviews on initial release of a product and then decides they have to cut costs.  Maybe this is one of those cases.  I can't otherwise see how this became an Amazon favorite.
3367677
I love that I can use this water filter in my apartment. No more pitchers that don't filter quite well enough, and no semi-permanent plumbing to deal with. My water tastes great now, even after 8 or 9 months. My only complaint is that I think the unit I received was flawed. I can't unscrew the housing to replace the filter (I tried for like an hour while my friend's unit unscrews with no trouble at all), and it didn't have a female-to-female adaptor for my faucet (luckily my local Ace Hardware had one for less than $5). Guess when it comes time to replace the filter, I'll just replace the whole thing. It's not that much more, anyway. Still giving it 4 stars because for the price, it's really worth it!
2967929
Pump is nice and strong, but the check valves are poor. It is hit or miss if they seal at all - sometimes all the water drains back into the reservoir within a minute. I returned the first unit thinking it was defective, but the second is not much better. I wouldn't hesitate to use this pump, but you may wish to install a second in-line check valve.
2787157
I got this unit awhile ago. Initially it was working flawlessly, but now its modes don't seem to be stable. Sometimes it will be in spray mode, pushing down on the button will switch to stream but will only stay in stream mode when the button is pressed, letting go and it will either switch back to spray mode or it will just allow a little trickle of water coming through.

Update
After chatting with Zoey, a representative of Hotis home, she sent me a replacement head for the faucet, which fixed the problems that I was having with the unit, which is now working as expected.
2958824
I replaced an older Pfister shower combo with this one when my bathroom was remodeled. The old one looked similar, however the water came out much stronger. This one has the "rain" effect, which is nice, but no way to adjust the pressure. Unfortunately most shower heads have this problem now due to water consumption regulations. The handle was shipped with a defective valve, and since we needed one immediately we had to purchase one on our own. The handle is a bit flimsy compared with our older unit, but it doesn't bother me.
1180797
It's a sturdy little sink that fits places you couldn't put a full-size utility sink.

I hope I never have to replace the faucet because it's a wall-mount type, and those are expensive as hell!  And the valves turn the wrong way.  Rotate right (clockwise) to turn on, left (counterclockwise) to turn off.  What's up with that?

The one I received leaked at first because it came with a bad washer.
801374
I purchased two of these units, one for my mom and one for my husband.  My husband was having sinus/nose surgery and needed to keep mositure around him - our unit worked great - didn't have any major problems.  The unit would stop running a couple times, and we found that we had too much water in the spout area - which you really can't control, so you have to drain that out and then it works ok.

The unit I purchased for my mom leaks around the spout unit.  We ended up with a big puddle on her wood table from it.  We tried another spout and it still leaks, so some how the unit has the issue.  My mom is wrapping it back up and I need to send it back for a replacement or credit.  She likes the portability and ease of use, just wish it would not leak.
2385266
I bought this to use at work and am generally happy with it. There is one odd thing though. If I fill it by removing the reservoir, filling it and then re-installing it, it will not pump water properly. I called for support and was given some things to try that didn't really work well. Oddly enough, if I just fill the reservoir by pouring water into it from a bottle, it works just fine.
4666190
I purchased this unit for our guest shower.  It is easy to remove the flow restrictors (I'm on a well).  Perhaps due to the way the pipe comes out of the wall, I think that the hand-help unit is too high and the fixed rainshowerhead is too close to the wall, too sideways on the body, and too soft of a water flow.  These seems like design flaws.  However, my guest was happy to have her own shower and the water flows nicely through the hand-held unit.  I think the I'll replace the rainshower with a Speakman shower head unit.
3649832
Good pressure, lots of water on you when you shower. It looks pretty high quality, in spite of being plastic. Easy to install.
Issues:
1. You can't change the shower head setting once your hands get wet.
2. The handheld unit will pop out of the holder from time to time.
3. This really needs a strong pulse setting, but it doesn't have it.
4. The low pressure setting has no use what so ever
3204134
I just got this product, 2 in fact, and installed one two days ago. The chlorine filtering seems to be good, but I have not quantitatively verified it.  The housing feel quite fragile.  I made sure to hand tighten only, but two problems surfaced: (1) the shower head side leaks water as a tiny jet and sprays the ceiling wet...I have to seriously hand-tighten, but movement of the shower head mount can untighten easily. (2) when the shower is running, a high-pitched noise is produced, and my dog goes bonkers (I kind of do too, but it's less of a bother for my aging ears).
1348758
Flawed design: reservoir does not fill correctly
1623614
So this feels pretty solid and was easy to install.  The problem lies in the faucet head.  After a few days the water pressure fell to about half.  I contacted the seller and they were responsive and sent me two replacements free of cost.  Those both failed after a few days of use as well.

Customer service was fine (shipping took a while) but the faucet head just was lacking in quality - in all three that were sent.