Did my ATP years ago through All-ATP's, already had the written done, self-study (personally, I wouldn't bother with the written-prep course, just get the big red book and dig in.) Had well over the 1500hr minimum, had lots of piston-multi time already. To me, the hard part, as it would be at any fixed-price "quickie" program, was trying to get comfortable and smooth in the PA-44 (or any other unfamiliar aircraft) in only a handful of practice hours. If I had been able to take the ride in the planes I was current in, (part 135, twin Cessna's), it would have been a cake-walk. That said, it can be done, simple enough for anybody used to the checkride routine; if a candidate wanted to really be sure of an easy pass, budgeting a few more flight hours for familiarization with the aircraft to be used would certainly help. To the OP, looks like you've had previous PA44 time, probably a non-issue.