I've got the 487X. I've heard both good and bad. Mine need work.
I'm not gunna worry about it and buy Vortecs
__________________
'72 C-10
350 w/Lunati Voodoo cam (207*/213*, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers.
Support your community, support yourself. Buy local, buy American 
(or Canadian).