For me it is simple:
A SAM running OS4 is not better than my Classic, with it I can do many things a SAM with OS4 cant.
I play Amiga games with no compatibility issues, I have USB 2.0 support and watch TV on my workbench screen. On the SAM I cant do those things.
BTW, I have used OS4 for a week (Clean install), and it was so unstable, it gurud all over the place. It had like a million of preference programs that half of them were redundant.
I sold my SAM a month after I bought it.