My iSub has a problem, but it definately isn't bass. heck, I'd love to see a setup with the soundsticks, and the iSub added... that way you have a strong sub, a weak sub, and the best sound sticks around
isub is considered more powerful than the soundstick sub, probably because the drivers don't have to be powered, more power to the sub. And in OS X you can use an infinate amount of USB devices, so basically you can have 10 isubs, and 10 soundsticks with no problem
However, my sub makes a LOT of noise when it's doing nothing, like you can hear the transformer or something.. kinda like a buzz noise, but really quiet. The worst part is you can't leave it on because that noise gets a little annoying (if the computer is off, therefore I keep shutting out my computer's surge protector.. blech)
And obviously the G4 doesn't like the surge protector being off all the time because it has to 'warm up' which can take a whole minute or two (at the happy mac thing) before the OS does anything.
Weird it is, but I wish the isub had some kind of switch or something that would turn it off when the computer went off!!!!!