Albert has commented on the new Aesthetix Saturn series of preamps, but without a specific comparison to the Io, in an earlier thread:
http://audiogo5.iserver.net/cgi-bin/fr.pl?eanlg&1060711017&openusid&zzAlbertporter&4&&
http://audiogo5.iserver.net/cgi-bin/fr.pl?eanlg&1060711017&openusid&zzAlbertporter&4&&