They shake like crazy. Also, any Saito over 1.15 in size doesn't really "jump" a plane out of a hover. To me they seem to have retarded throttle responses at the expense if great reliability.

As ThumbSkull said, the smaller YS has more "oomph" as it really benefits from the pressureized fuel delivery.

I love my 82's (which also shake like crazy) but they run forever and do wonders for a 4.5 lb 3D plane. I also love my 100 on a 5.5lb Mojo 60. I even love my 1.25 on an OMP Fusion (~7 lbs) but it just doesn't snap around like the smaller ones even given the slightly larger size factor. A YS 110 is way better for the same size.

I put a 180 with a Menz 18x6 on a 10 lb Funtana 90 and although big and loud, it never seemed to act like it had the power in transition. I also replaced all the CA hinges with dubro steel pin ones and got rid of any plastic servo arms cause that motor pounded everything into submission.