Monitor Audio Studio 50's

Anybody have experience with theses speakers? I have had Studio 20's for ten years now and thinking about these ( on audiogon). The 20's still sound exellent but they have a rear port which can't go near a back wall, the 50's are sealed and go much lower in bass. The 50's are in rosewood and look to be in fine shape . Nac 82,hi,cdx,nap250, and naim wire. Let me know, Ted.