Hey!!!
I'm still using the PB suspension on my original T1 (the very first one). I agree on the convenience on changing of casters. No need to buy new caster blocks.
Regarding the PB suspension being too heavy, I haven't weighed it yet but I believe the a front PB assembly (arms, upright, axle) is still lighter to a C-hub assembly using the aluminum parts. Some people resort to aluminums to remedy the C-hub frailty
(This only applies to drivers who still have issues with the barriers)
The PB suspension is harder to setup but it's a small price to pay to greater adjustibility possible. Just by moving clips, you can try out all possible caster without going out to buy a different block.
and my favorite part...
no more kingpins going loose on you.
impulse racer: thanks for the info re: the short arms. What else do I need to convert to the short arm?