I have to agree. Many devices just need more power than they can get from a unpowered hub. The more devices, the more demand. The computer is limited how much it can deliver.
I have used usb for years and love it, however my rule of thumb has been to buy hubs with power adapters. You may not need it, but it is there when you do. In addition, with a little searching one can have a powered hub for close to the same price as an unpowered one. This unit I have a few of. It is very flexible, i.e. usb cable can be used by itself as well as the hub and adapter or in combinations. The price is less or equal to any combination of two pieces in the 3 piece set. It has been available at WalMart. The only downside is the power adapters can produce a hum in varing degrees, from none to a little more then you would like in a very quiet environment. With my netbooks running on SSD's (no moving parts, i.e. fans, disks, etc.), thus no noise at all, the adapter needs to be the same. I have exchanged until I get dead silence units.
http://www.radioshack.com/product/in...LAID=107595873
One reason I suggested the single usb cable was to narrow the field as to devices and save myself some explaining.