We have updated to the newest version of the forum. Please let us know if you see any issues. And, yes, we know the shoutbox is gone. We'll see about getting it back if they make a newer version.
As stated before the 7428 is rotary and if you don't know what you're doing goodbye paint job.
The 7242 and 7336 are both DA. The only difference is the counter weight and with either 5 oz or 6 oz the thing shakes like crazy while using a foam polishing pad.