I have an A3000 tower that had a Warp Engine 040/40 mhz and when I hooked it up I noticed how much more responsive that was then my A4000 with a Commodore A3640 board and 16 mb RAM - so I made the switch. The Warp Engine is the version designed for the A3000 - only two RAM sockets instead of 4 in the A4000 version, but it works just great! I would say it feels like it is running three times faster - everything from the video, to the hard drive and opening icons just feels like a new machine. I read the manual on the Warp Engine, and it seems like a lot of the speed up comes from the way it address's RAM - just tons faster than the A4000 RAM.
I was going to switch over to booting from the SCSI connector on the card, but I hesitate to lose the versatility of booting from a 16 Gig CF card - which now reports data transfers of 2.9 Mbs as opposed to the old 1.4 Mbs. I could put a SCSI drive in as a secondary drive - but why? 16 gigs is overkill as it is.
The Warp Engine has a 32 and a 16 mb chip - next I will replace that 16 mb chip with another 32!