I've never bought one of these turds, but have installed 2 of them for customers. both were supposed to handle 600 hp, neither engine made over 500 and combined the two made it about 75 miles.
The overlords at Monster told both of my customers to pound sand, no warranty, the engines were making too much power. More difficult than throwing money in a pit, but just as effective. One transmission is a n AOD for a 390 Ford. The input shaft snapped in half within about 40 miles.
The starter design is the stupidest thing I've ever seen with some weird adapter plate and the starter being held down by two 10-32 bolts. Starter would not physically fit in the hole, had to remove the whole mess and modify to make it fit, no adjustment and it sounds like crap.
Reason of review: Bad quality.
I didn't like: Either transmission.