I'm using the SA-15S2b and love what I hear. I have no experience with the SA-11s2 so I can't comment on this.
Marantz tends to do nice upgrades to their newer models (more digital inputs and maybe incorporating streaming) so it's kind of a crapshoot as to whether to get the Sa-11S2 for what seems to be a great price or wait and pay full boat for something that maybe takes a sideways stance on sound but offers more features. Personally, if I were just spinning sliver discs I'd go for the heavily discounted model.
All the best,
Nonoise
Marantz tends to do nice upgrades to their newer models (more digital inputs and maybe incorporating streaming) so it's kind of a crapshoot as to whether to get the Sa-11S2 for what seems to be a great price or wait and pay full boat for something that maybe takes a sideways stance on sound but offers more features. Personally, if I were just spinning sliver discs I'd go for the heavily discounted model.
All the best,
Nonoise