They are slower than molasses on a cold winter's day. I've got one in my little Ford fleet (95 Mustang GT, 96 Thunderbird LX 4.6, and 93 Mustang LX). It's been a trooper (123,000 miles) and gets killer gas mileage, but like I said, it's slower than slow.
In fact, it finally started acting up yesterday. The engine started hesistating big time and shaking, seemingly out of balance, at lower RPMs while in drive. Happened all of a sudden. Once I get it to 3000, it smooths out and accelerates like normal. Now I have to devote time to fixing the 4banger which was allocated previously to modifying the 8.
