I only did the Quant Section of the test since required by my institution:
Manhattan 1: 160
Manhattan 2: 163
Manhattan 3: 161
Manhattan 4: 160
Manhattan 5: 161
ETS paper 1: 162
ETS paper 2: 165
Powerprep 1: 167
Powerprep 2: 162
real score: 164
~ 80 h
I had a really bad feeling while taking the real test and didn't feel very comfortable that day. Still quite happy with the score since that is exactly the score I wanted
However I think the Manhattan tests are defenitely harder than the real thing. So do not give up if you're disappointed with the scores you get in the Manhattan tests. Reading trough all the posts here I think that (at leas in quant section) your scores on the real test will be 3 points higher on average than the ones you got from Manhattan.
