I prefer the imaging from floorstanders (or monitors) deployed in free space. OTOH, Shadorne's observations re: smooth bass response are spot on - in wall placement will make a lot of room related issues in this range "moot". Personally, I use floorstanders and EQ'd subs. This arrangement addresses both issues while still allowing a (reasonably) "purist" signal path for the main speakers. Just my preferred approach. YMMV.
Marty
Marty