[josefresco]

I use one of these bad boys: http://www.amazon.com/Gaiam-Balance-Ball-Chairs/dp/B006JBWYD...

My wife/business partner also uses one and (begrudgingly) convinced me to ditch my $300+ leather office chair for one.

I'm sold. It's the best option short of sitting on just the ball part (which engages more balance muscles)

The best part is your can't "slump" into the chair if you're feeling tired. The best option at that point it to get up and do something else as opposed to fighting your body and relying on a Lazy-Boy approach.

What I like especially is that when listening to music, or when you're feeling energetic you (subconsciously at times) tend to bounce and roll your butt around on the ball which exercises even more muscles in your back/lower body.

[sitkack]

Sitting on just the ball I got pretty good at "slumping", if you grasp it with your thighs and roll backward you can perfectly balance your weight between your torso and legs. No correct posture needed.

[joemaller1]

Most of the advantages of sitting on a ball are negated when you put it in one of those fake-chair things. Try the ball by itself.

[josefresco]

I did, and it's too much. The chair is a nice in-between solution while still encouraging you to sit upright and balance yourself.

[wyclif]

How good is the quality on the coasters? The rest of the chair looks good, but those coasters look like cheap plastic ones that probably wouldn't last too long.

[sizzle]

carpel tunnel for your wrists when typing?

[josefresco]

Nope, my seat/ball and desk height is correct making that a non-issue for both typing and mouse control (I do more mouse clicking than typing) As long as you measure everything correctly you won't have issues. Also keep in mind the height and depth of your monitor placement. You don't want to be leaning in, or looking down/up all day. Pretty basic ergonomic stuff.