I held on to the cover with good grip, but they slipped right off
920873
They work, but the covers on both of mine come off when trying to remove from my Nexus 5X.  I held on to the cover with good grip, but they slipped right off. Otherwise they are a great idea.
2776143
Good color match with the band and easy to install, but also very easy to fall off without my knowing. I lost it in a month or two, and I don't even know when!
2451743
They snap on easy enough but are not very secure.  They fell off easily especially if it was windy and, unfortunately, I live in the "Windy City"
3032862
These look good, but the second day that I used one of them, it slipped off of my clothing. I do not know where it fell off, so I no longer have  fitbit one to use with these holders.
3939415
The color matched interior great, but my phone slips right off.  I have an IPhone 6S, had an otterbox defender on it and thought maybe the case was too heavy so I bought another case and the phone still slides off.  I put two magnets inside the case, still no luck.  Well made, color is great but unless you have a very light phone with no case, I would not recommend, unfortunately.
1596079
My wife wanted this for the color, and she was delighted.  I wanted to keep her using her Otter case with much more protection, but lost the arguement.  The third day she had it, it slipped out of her pocket at Newark Airport (the case is very slippery) and was eventually found a quarter centimeter from falling off the seat onto a very hard floor.  We escaped without loss of or damage to the phone, but it could have been disastrous.  Anyway, I wish this had more protection and a non-slip surface around the edges, but then I know I'm more safety conscious than most.
3432735
I initially liked this cover. It was easy to attach, and seemed to be perfect. Unfortunately, it didn't want to stay on. After only two days of wearing this cover it came off and got lost. I suspect it got caught on my pocket or on my jacket's sleeve, but don't know for sure.

I'd recommend looking for a cover that the watch band has to pass through or that has some other sturdier connection.
925180
The cover/wrap kept slip away from its position. Took me at least 10 minutes to wrap, but when it seated, it slip off again. Need a lot of patience dealing with this toilet seat cover.
2184646
I just got these a week ago to replace a similar pair of laces that wore out.  They have a nice, high quality look and feel to them, but they keep coming untied.  Perhaps that will not be an issue once they're more broken in, but it seems that they're just a bit too slick to grip properly when tied in a single knot.  They seem to be made of 100% polyester or a similar material rather than a natural fiber, so that may be why they don't grip well.  There were pretty inexpensive, but it's annoying to have to retie my shoes several times during the day.
13935
I like the color a lot and it was easy to put on my computer. The little white pads at the bottom are stick-on and... well they don't stick on too well. I will have to superglue them as I've only had this cover for a month or so and one of them has already fallen off... Also, it doesn't bother me but just fyi this is quite heavy--there's a big difference in weight between the computer with and without the cover. Considering weight is an upside to the Air, just thought I'd mention it.
2749180
its a nice cover and fits tight to camera, but i did not like it because it prevented it from slipping in and out of my pocket fast because of the sticky rubber. My camera would look a lot better shape if I kept it on or used it a bit more but oh well. If you want a protector this will do the job.
4121726
I also feel some anxiety about it falling off but wham I was in a hurry to remove it - I couldn't !
2400333
I love my daisy brake light covers but unfortunately they fell off only 1 month after putting them on.
4276815
Clamps work well, but I had to glue the grips in place to keep them from sliding off all the time.
3726754
These nylon straps need a little rubber added for grip.  They slipped off my bag a few times under heavy vibration.
349438
They fit beautifull, are comfortable for all-day wear, and look wonderful.  BUT after one washing, one of them completely lost its grip.  The "sticky" silicone on one stocking no longer held it up, so the pair was useless.
4569848
I love how thin this cover is, and the price if fair, but I would have preferred the material was a bit more grippy. It's not that it's slippery, but with my dry skin, I prefer something that can be held loosely without slipping at all.