The sticks they use are a knockoff of the
Happs Super Joysticks.
The Real Bob Roberts sells them for $9.50 ea., and they are rated to 10,000,000 cycles.
The buttons are knockoffs too.
Bob sells those for $1.45 ea., and is real good on shipping costs.
Given that pricing, the ebay deal is pretty good for what you are getting.
The shipping is good, and the price is worth it for the buttons alone.
One thing I would point out is that the 4-way function on the Supers is about non-existant.
They "claim" that you can do 4-way by switching the actuator around, but they don't really work that well for 4-way games.
There are alot of sticks out there that I think are better than these (T-stiks, Wico leafswitch sticks notably), but you will pay for them.
All of these sticks/buttons will work with a keyboard hack, but you are better off getting an encoder (KeyWiz or I-pac).
The work is alot less (screw terminals, as opposed to soldering on the circuit board), and the results are much better.
Keyboard hacks usually have problems with not allowing certain keys to be pressed together (matrix issues), or sending false codes when certain keys are pressed together (ghosting).
The encoders eliminate this because they are designed to be multi-controller devices, which merely "pretend" to be a keyboard.