I disagree, I like Sanwa J-Stiks (no idea what part no. these are derived from) for schmups. I like the light action for fast movements, and flipping the restrictor over reduces the throw.
I thought the same when installing J-Stik first time but it was false.
I play on shmups. Yesterday I finished Cyvern on 1 credit.
http://marp.retrogames.com/index.cgi?mode=search&short=^cyvern$
First time I used T-Stik, next J-Stik and I say - what excellent controller for shmups! But not, manoeuvre in hail of bullets is impossible with J-Stik. I change joystick to T-Stik again and I finished this game.
OK, the end of story, now about joysticks.
I tried shmups with 3 joysticks: X-Arcade, J-Stik, T-Stik.
X-Arcade - totally crap for shmups, too long throw
J-Stik - crap for shmups, good diagonals but throw is too long still
T-Stik - good (not excellent) for shmups. Short throw - excellent for manoeuvre in hail of bullets, but spring is too hard, you must use too much strenght for manipulate this stick
I didn't test Mag-Stik, P-360 and Seimitsu.
I prepare P360 in this week for Donpachi.
If you are interesting on MARP are bounties for some shmups:
http://forums.marpirc.net/viewtopic.php?t=12297