I've played on the Pirineos in a private home and Regenta @ Shakespheres in Denver. Both were Carom tables (Shakespheres had 4 or 5). All played excellent. Raymond Ceulemans was at Shakespheres for a 4 day clinic and he didn't stop commenting on how well the tables played.
I'm just speculating but I think the steel frame is where most of the change is. They now call it a "solid steel frame". This might mean welded?? I saw another Sam table not long ago and the frame was bolted and looked crude. Just an opinion. Never saw other frames. Seems the change came in 2010.
http://www.billaressam.com/subcategorias.php?idioma=en&cat=1&sub=488
As a side note, being from Belgium I'd be looking at Verhoeven as another choice.
Just remembered there's 2 more Sam tables I played on in George Ashby's place. They played great too. And by the way Shakespheres pool tables (about 25 of them) + 1 Snooker table were also Sam tables. Very nice place.