who are faster
You can criticize Radioshack many ways but it is very difficult to beat walking into a Radioshack store and picking up your parts right there, especially for the internet age.
Yes, absolutely. IMHO there are two things that Radio Shack clearly had a lock on....
1) As DannyF said, immediate "walk-in" availability. And a pretty uniform product availability across all the storefronts.
Over a decade of using online forums (Usenet, and then web-based forums like this one),
it was very handy to be able to refer someone to their nearest RS storefront with an RS part number.
It is a shame that their management never seemed to understand that model and tried to appeal to a "broader market" with plush animal toys, etc.
2) Their range of power plug options (which fit their generic range of wall-warts) was unprecedented.
IMHO, they got that part absolutely right and had a killer product.
Many times I have taken in orphan gear to test the different plugs to find which one fit my gadget.
That plug tester and all the available plugs is (AFAIK) something not available anywhere else.
I really hope some other retail chain picks up that product line. (Like Best Buy or some other widely-available operation.)