Can't say how the newer Simplicity machines will stack up against their older models. Other than the Pro series machines, their product line has, as with the other domestics, isn't what it used to be. I was fortunate enough to get one of the last non-pro machines to roll off the line of the Wisconsin plant. It's a very serious machine with many of the attributes of the Pro series less the square channel handles. I've had mine for going on five seasons. It's been bullet-proof so far and is one of the best performing snow throwers I've seen.
Personally, I'd buy a used pre-2006 Simplicity in decent shape. It will likely outlast their newer non-pro machines.