Yup i have one on my truck, they are very very strong and as said can winch in all gears, high/low diff lock/unlock or neutral box, they are idealy a two man operation though as the winch speed is controlled by gears/throttle, and the free spool can be a tad hard to get into neut5ral when then einch is under load, i find its best to clutch in and spool out a little bit.
For long periods of serious winching they are supposed to be good, nothing to overheat, but i beleave hydraulic are the way to go, if you can afford one, only problem with a PTO is of course, if your engine is stalled/dead, you have no winch.....
CHeers