I read that same Stereonet review and missed that it didn't mention the use of GaN FETs. I guess from all my reading up on reviews I took it for granted and just didn't notice that. Maybe it wasn't that big a deal to the reviewer who should have know better.
I agree with your choice of going for the SL-G700 SACD player as one dedicated to a particular format is better than a jack of all trades since there's no short cutting and therefore compromising.
Even though I was told by MusicDirect that it wouldn't be that big an improvement over my Marantz SA-15S2b, after listening to the SU_G700M2, I think their SACD player will extract that much more out of a recording (both CD and SACD) than the 9 year old Marantz can.
All the best,
Nonoise