One last design note: Alternatively, instead of clipping the speaker onto a tablet, you can simply leave the speaker sitting on a table--the clip folds back into the speaker--and plug into any device, including a smartphone, iPod, or laptop.
There's only a power button on the speaker (no volume controls) and the speaker uses a nonreplaceable rechargeable battery that you juice up via USB. Battery life is rated at up to 8 hours, which is good. Logitech also throws in a protective cover for the speaker, a nice bonus.
As far as sound quality goes, it's not great but it did exceed my expectations and is a significant step up from the internal speakers of the iPad. No, it's not going to fill a room with sound, but for the purpose it was intended for (louder listening), it works quite well and plays sufficiently loud.
Because the speaker fires out the sides, the sound is very directional and will shift as you move the speaker around. It sounds best when your head is centered in the middle of it (looking directly at it). Also, if you put the speaker on a table (it will support your tablet at a typing angle) you can get some reflection from the table and improve the sound slightly. Putting the speaker near a wall will also help the augment the limited bass a bit.
That's really all there is to it. After using the speaker for a couple of days, I really didn't come away with any complaints. In short, Logitech's Tablet Speaker is a versatile accessory and a relative bargain at this price.