Does it matter how long the usb cable is for the usb risers?
Yes, there is a theoretical limitation. I believe USB spec used to be 10 meters, but USB 3.0 is likely different. I have used plenty that are 1M long and they work just fine. The extra shielding and twisted pairs are what lets a USB riser work while being so long though.
Yes, that is a good one. They are around for cheaper than that though. I've seen them down to $18 or so recently, check the forums, ebay, and litecointalk.org marketplace. You should not need to do anything to make these work like a champ. They even have built in 1x presence detect jumpers so you don't even need to do that!
Thanks for your reply!
It gets difficult to educate the "Plug And Play" crowd!
My $.02.

Not a problem!