Works well, but only for a very short time
348385
The product worked well in the beginning: as the instructions stated, I simply fill up the diffuser until both cups are filled with CO2 then wait for the simple diffusion process to bring carbon all around your aquarium.

On the second day, I noticed the bubbles do not stop after I've tightened the regulator with my hands.  One bubble per second was wasteful because the diffusion process is not as fast and the cups overflow.  It could also prove dangerous to your fish having CO2 at night because plants do not take it up then.  I used pliers to remedy this, but they also became ineffective after three weeks.  Wasted CO2 amounted up to two bubbles per second.  Subsequent cartridges lasted two days each!  Wasted CO2 = wasted money = waste of time.

I got the items from a Canadian company, not from Amazon.  I may have been unlucky and got a defective product, but I will not purchase this item again unless I have a full money-back guarantee.
3246069
Works beautifully, but only for short amounts of time; in prolonged stretches it caused sores on my cat's chin.
1678389
Pro: The product is quite sturdy, most of it cast aluminum, which is nice.

Cons:  The blade spins very slowly, which causes trouble if not kept extremely sharp.
Most importantly, the unit stopped working after just 2 months of very light use.  I mostly just used this to slice cheese, and after a total of 3 wedges, it stopped working.  The motor does not appear to have over-heated, and the fuse is intact, but it simply stopped turning on.  I will try and return it, and if the return is simple enough and the replacement works, then I will consider a higher star rating.  However, for it to have simply stopped working so quickly and suddenly is very disappointing.
993091
This product worked great for about 7 months then... So we would give it 5 stars if we only bought it to use for a few months, but durability brings it down to one.
4413727
This worked very well for a few months. I added an external antenna to help boost it's range which resolves the most painful issue most people are having.  But after a few months of being plugged in, it just stopped working. I think you are supposed to disconnect the power when you are not using it, but i wasn't about to do that.
361200
This was a great little meter while it worked, easily a 5-star product.  I verified that its accuracy is 0.1V, and it's very nice-looking.  However I gave it only one star because it died after just under a year of very minimal use.  About 1 hour per week of use only during the summer, so less than 16 hours total on it.  I contacted the seller and unfortunately they don't stand behind the product's quality, only offering a discount on buying a new one.  I have installed several of these over the last year and really hope the others last longer as I can't replace them all frequently, but the seller did not give me confidence that that will be the case.
1629647
This collar worked wonderfully for about 3 months. My cat stopped scratching and I didn't find a single bit of flea dirt on her. Then it must've stopped working, because my cat started scratching again and I found a couple HUGE fleas on her. Disappointing, especially since it worked so well at first (and was so expensive).

It is neat that the collar comes with a few reflective tabs. My cat is indoor-outdoor, so it was nice to have them on the collar.

Update: next collar still only worked for a few months. Probably about 4. I have a feeling this might be an "8 month" collar for indoor cats. Any cat that goes outside will have a shorter life on their collar.

Still protects fantastically for those handful of months though, and is less expensive than flea-bombing your house.
1537563
This is a good way of stopping your dog from barking.  I only used it in social situations when my dog would bark too much, and it worked well.  He didn't want to get sprayed so he wouldn't bark.  But it only worked for about a month, and that's with occasional use.  I changed the battery, I filled it back up, but it doesn't work anymore.  It broke too quickly.
1546099
Worked really well for a few months, then suddenly stopped
4492337
I actually really liked this and my cat that used to bat at water - getting it everywhere - stopped. Both of our cats seemed to like this. The reason for only 2 stars is because after less than two months, it no longer works. I unplugged it to clean it and give fresh water and when I went to plug it back in, nothing happened. I tried a different outlet just in case and still nothing. This is too expensive to only get about 5-6 weeks of use.
4038723
This charger worked well when my other one went bad.  It was also very inexpensive.  However it has stopped working after 3 months.  Some other reviewers mention the loose connection to the adaptor and that is what has happened with mine.  Now it is not charging at all.  But I don't feel a huge loss because I didn't spend much money on it.  Thought I would take a chance, and I did, but now it no longer works.
102290
very affordable, but did not last too long
stopped working after just a few months
2908462
When it worked, it did what it supposed to do. But after a few months of light use (less than twice per week), it crapped out on me.
3925994
Worked very well when I had it, however as of today after 6 months, it just doesn't work anymore. 1/4 lights work on the switches, nothing in the slots however work.

What I've done with it: Really only connect my Mechanical Keyboard to it, sometimes a gamecube adapter, had 0 problems. After 2 days of plugging in my phone(only with keyboard otherwise) it started to become weird and wonky. All I have to say, is cheap, did its job for a small bit, fragile.
2096055
It worked great and neutralized odors in the kitchen for about a month of off-and-on usage. One day when it was running, the fan or motor suddenly started to make a loud noise as if something got stuck. Gradually turning the ozone knob slowly from off to on and maximal ozone worked maybe 1 out of every 10 tries. I eventually gave up and have chucked it up as a loss. Considering I have left this ozone generator on for only a couple days here and there while I was out of the apartment, the lifespan of this product is disappointingly low.
4704944
I bought 2 of these.  They both worked well initially.  They both lasted less than a couple months before completely stopping working.
2266966
Stopped working after only a short time of use. I bought two just in case and second one did the same. I wished they would have lasted longer.