hi guys - i think i can shed some light on this debate by recounting my P360 journey...
i, too, bought P360's with slikstik handles, based on the retroblast review. i used them quite a bit and was happy with them. i'd routinely get into the 500K's in robotron, and my high score was in the low 600Ks.
over time, i began to become a little uneasy. usually, i'd be killed for "the right reasons" - got herded into a corner, was surrounded by a hail of guided missiles, etc. but sometimes i'd think "that wasn't my fault... i knew i needed to shoot in that direction, and i thought i was shooting in that direction, but the shots didn't go where i thought i was pointing the joystick."
then, i saw kowal's post about modding the P360's and decided try out his mods: smaller diameter actuator, shorter handle, lighter spring (the shorter handle gives you less leverage, and your stock spring feels much too strong).
these mods seem very subtle, almost imperceptible, under non-stress situations, like the early levels of robotron, but when things start to get really intense, they make a huge difference. i had the "shots didn't go where i thought i was aiming" experience a lot less, and i started thinking things like "wow, that was a very tight spot, and i'm used to getting killed in situations like that, but somehow i seem to be able to magically sneak out of these tight spots a lot more than i used to." now, i routinely get into 800K's and 900K's, and my high score is 1.3M.
thinking analytically about my game experiences, i realized "the shots didn't go where i thought i was pointing the joystick" was always when i was trying to shoot diagonally. sitting in a calm, near-empty screen on level one of robotron, testing out my joystick, sending shots in all directions, i would have said "the P360's diagonals are fine." but after playing extensively at high levels with and without kowal's mod, i am now convinced that a stock P360 doesn't have enough diagonal. if you took away my kowal-modded P360s, and i could only play with stock P360s, i'd start dying more often from missed diagonals and running out of lives in the 500K's again and i'd become frustrated and scream in disgust, "THESE STOCK P360S HAVE TERRIBLE DIAGONALS."
the same can be said for engagement, which is determined, on a P360, by the diameter of the actuator, the height and weight of the handle, and the strength of the spring. in robotron, engagement matters more for the left-hand (moving) joystick, than the right hand (firing) joystick. the faster engagement of my modded P360s translates into more precise movement and the experience of "i can sneak through tighter spots than i could before." initially, i had no complaints about the engagement of my stock P360s, but after playing with the tighter engagement of my modded P360s, i judge the stock P360s to engage too slowly.
getting back to the current debate, i fully understand why one side can say "stock P360s are great," and the other side can say "stock P360s are terrible," since i myself have held both positions. unfortunately, for kevin and james, i think kowal and destructor have the more "enlightened" position.
since i've realized that i can be happy with something, not knowing something better is out there, i don't assume that my current setup has achieved perfection either. perhaps something will come along that's even better. i'm currently playing with suzo inductives (with another kowal mod) and will probably try the U360s some day. i actually think it's possible to make "the ultimate" joystick;
click here for details.
kevin - here's a challenge for you: the modded actuators are available very inexpensively from kowal, and ponyboy can sell you 4" wico handles and happ supers (to steal springs from) also inexpensively. give the kowal mods a try, and see if your opinion of the P360 changes. i'm sure your readers would find it most interesting.
or how about this: i have a pair of kowal-modded P360s and a pair of kowal-modded suzo inductives. if you'll buy me a pair of ball-top U360s with wiring harnesses and restrictor kits, i'll write you "the ultimate robotron joystick shootout" article