The Marantz Reference series integrateds are excellent solid state amps. I have auditioned the PM-11S3's little brother, the 15S2LE several times and finally broke down and recently purchased one. It is now happily driving my 4 Ohm Vienna Bach Grands to new heights. The 15S2LE has excellent build quality, more than enough power for my needs and most important of all - it is extremely musical! Needless to say I have not been so enamored with an amp in a very long time.
And this is the smaller of the two Marantz reference amps. I can only imagine how great the more powerful 11S3 would sound. You have not mentioned what speakers you plan on driving with it, but I can reasonably say that the 11S3 will handle anything you hook up to it. And make you very happy.