I am using a Sony BDP-BX57 (S570) for 3D and a Panasonic BDM-BD-55 with 7.1 analog outs for 2D.
I know both have been around for a while. I have went through several firmware updates on both players (wireless and wired). They work as expected without any hick-ups. Also have a PS3 fatty that has not given me any problems.