Tom you summed it up pretty well. Radio Shack had (generally) lower quality parts at higher prices than places like Mouser and Digikey. It was hard to find a reason to go, unless you needed an obscure battery or you needed a resistor or switch that very day. Tools and general goods were all overpriced, $40 HDMI cables and $20 plastic solder suckers, it's hard to imagine that inventory turning very fast.
I was, however, able to take advantage of the closing, I got about $100 worth of switches, breadboards, pilot lights, and other minutia for like $20.
It will be interesting to see who buys the storefronts... Sprint, Amazon, etc.