yeah, being how small it is, I wouldn't want any more...think about it, it is at most 1/10 of the size of a typical 10w practice amp...so basically it is just scalled down...of course I wouldn't want it for bass because you would get zero low end out of those little bitty speakers and even practice amps need to have low end
If you play your bass through it, it'll act like 0 watts after a few minutes. I have one of these for guitar. Meh, but I only paid five bucks for it, so...