Love 'em. All good parts (really good parts), closed cooling, never stall around the docks and run like a top. If you get ones with Eickert manifolds, be real careful about keeping your strainers really really clean - I've had some problems with the right hand manifolds getting hot and cracking. Seems like the left sides live OK.
...and $37,000 cheaper per pair than 575SCi's.... (True)
Too bad they don't sell 'em anymore.