Comfortable. Doesn't slide around the desk. Help hold your wrist in the optimal position. Allows you a better finger grip on the mouse which can help reduce hand fatigue. Forms to your wrist.

It would be nice if the outer cover could be removed so it could be tossed in to the washing machine, but it's a small issue.

I needed to replace the gel wrist wrest that I used because it started leaking, and came across this one. Was kind of skeptical at first, but since I've been using it for the past week I've grown to love it. It's super comfortable, looks good with the rest of my setup and isn't ice cold like the gel one.

Umm, everything? It's cheap (ish), comfortable as heck, and has saved my wrist from mortal pain countless times. The coarser and finer fabrics on opposite sides are also a nice touch -- I started out with the softer one, but ended up preferring the coarser one, but that's personal preference. So really, what's not to like?

For me, nothing. As a previous reviewer mentioned, if you don't fingertip your mouse like me, it may be a bit high, but as a previous previous reviewer mentioned, I suppose you could then just position it further up your arm.

I had wanted a wrist rest for a while, but I had no idea what a massive impact it would have on my computer enjoyment. Probably the best ten bucks I've spent on my computer, and definitely the best price/performance ratio! Seriously, $400 video cards are great, but this is better.

Strengths? How about the fact I'm never going to get carpal tunnel! Hoo yeah, boi! Let this thing uplift your wrist and soften your muscles! This thing PWNS!

Okay okay... there's a flaw. It's a little bit too tall for the mouse I use. Once my wrist is resting on the bean bag I can't quite get the grasp on my mouse that I want. Even after ultra bean bag squishing it's still a bit too high. No big deal, I just have to get used to holding my mouse differently.

PURE LOVE! I wish I could remove beans from the bag without destroying it though.

Super comfy. The pad feels like (and may well be) jersey cotton or similar. Has 2 sides to chose from which feel slightly different, but both good.

Beads conform to your wrist. Unlike relatively stiff gel pads, this bead filled one conforms perfectly around your wrist.

Can be used several ways. I tput my wrist right into it because I finger tip my mouse. But it's totally viable to have it set up so your lower arm just above the wrist rests on it and you can palm your mouse.

None. I love this thing.

If you want what amounts to essentially the best thing in existence to place under your wrist while computing, look no further.