have one on my 3720,It was easy to install with a couple exceptions.If you have front tires in wide position you need to change them back or wheels wont line up with driveover on deck.The gauge cutting pin also needs to be removed so that mid pto will drop fully.This was not really addresed in manual it took me a minute to figure this out.
As for the hook up it is as easy as driving over it per the instuctions and your in business.For me i had the extra step of having to put midpto and bracket on tractor first(took about 15 min firsttime in future shouldnt be more than 5-10 min) because i had front pto for snowthrower on which means the mid pto does not stay on tractor all year just in summer for mowing.
I suspect all that have mid pto on at all times this really should be as simple as driving on and its ready for mowing.Good luck