cools the drink a little, but is not close ...
595404
cools the drink a little, but is not close to ice.  Don't understand the purpose other than being a gimmick
4512040
Its ok.  I don't notice much difference between this device and a 1 1/2 foot diameter fan I have.  Other than it stands high enough to circulate air effectively, I don't notice it cool off the room any more than a fast fan.  I added water and ice continuously but the results were that I didn't really notice a difference with water and ice or without.  But its portable and effective as a fan and perhaps there is a difference which I am unable to detect.  But next summer I will buy something better.  This one will be for sale if I can find a buyer.
1918985
does not stay as cold as expected. does not cool beverages very well
1241082
Meh, it's a cool bottle but I don't think it works much better than the pre-mixed stuff in the store.
3325595
Nice, but it only keeps coffee semi-warm. A bit disappointed.
3870187
This is not the ideal travel mug because your drink will spill out of the drink hole in the top when tipped over.  However, because of that hole, you can put carbonated drinks in it.  Can't do that with cups/mugs that close tightly because something causes the carbonation to fizz up and make a mess.  Don't know why.  I didn't test this for long periods like some reviewers did--I'm just taking their word on that.  It did keep my drink with ice very cold for 4 hours when I took it to the park.  Much of the ice melted during that time, but my drink remained very cold.
3797509
It does keep your drink cold for a while, but not hot.  My coffee was lukewarm by lunchtime.  I'll stick with my Thermos brand for coffee, I suppose.
4356744
Works for for smaller drinks, but I wouldn't put a large drink in it.  To keep it sliding around on my air vent I had to use a binder clip to hold it in place.
2372674
Barely keeps a drink cold.  Works a little better at keeping a hot drink warm.
4094401
Does not work very well to drink directly from the bottle.
1427033
It's a bit small and a little awkward to drink from.  The bottle seems solid though.  I've used it once...if I see anything else, I'll update my review.

Update: 10/28/15 - I've used it a few times now.  The opening is a bit small making drinking a bit awkward.  Dropping this to 3 stars.
4942730
Nice idea, not so great execution.  The glass is a double thickness filled with what appears to be alcohol.  The alcohol gets cold in the freezer, but does not freeze.  When you pour a drink into the glass, it takes a few minutes but the drink does cool off nicely.  Not quite as cold as it would with ice, but noticeably chilled.  If you pour yourself a refill, the glass will be too warm to do much chilling of the beverage.  The glass is not very pleasant to try to drink from since it is double thick and filled, giving the glass a thick rim.
3701962
These are OK...  they don't keep a drink cold for very long.
1988199
I travel  to  work and  have several cups similar to this.  The  slim  cruiser I  chose  due  to the  shape and  size. I needed a  narrow  bottom  for  certain  cup holders.  The  cup  looks  very  nice.  The  cup  handles well and  the lid is  a great  fit.  I  just  do not think  it  keeps the  beverages as  cold as  some  other  brands  do.  I  questioned this  more than  once and decided  to  fill  it with  cold  coffee and  ice  today  to see if the ice  melted down  and  the coffee  stayed  cold....Ice melted and  coffee  was  chilled but  not  cold.  This was over a  4  hour  period ,  I  traveled  to work and  then was  inside  an  air conditioned office.  80  some  degree  days  here  and  not yet  very  hot  for the  summer!
505870
Though I love the color of these (I have the red, blue and green), and the size is adequate, it does not keep drinks cold for very long.  I'm not sure what the liquid is inside, but it does not compare to other frosted mugs that I've had.  Keeps for about 30 minutes. Which is probably long enough for most drinks.
866027
It doesn't work nearly as well as the previous mug warmer I had.
I often put a full mug of tea or coffee on it, and an hour later, it's barely lukewarm, not a good drinkable temperature.
I'm still looking for a cup warmer.
185366
Although I will say the larger size helps with not watering your drink down, I hate these don't make your drink near as cold. I like a "ice cold" drink but these just don't do it.