On the front end, I have a Wadia 7/9 combo for red book, and an unmodified SCD-1 for SACD.
On redbook, I find that the Wadia combo has an edge over the SCD-1, but if I didn't have the Wadia for comparison I could be very satisfied with the SCD-1. To me it's truly a great player.
On a well recorded SACD, the SCD-1 is superior to the Wadia 7/9 on the equivalent red book layer.
PS - to Calanctus: On CD's there has never been a problem with perfect data recovery (otherwise CD-ROM technology wouldn't work)- the problem has been maintaining stable clocking information after the disc is read. This is a player engineering problem.