Manhattan 1 (before studying): 155Q, 160V
Manhattan 2: 157Q, 164V
Manhattan 3: 157Q, 158V (wouldn't recommend taking these at midnight)
Manhattan 4: 157Q, 161V
Manhattan 5: 159Q, 164V
Manhattan 6: 161Q, 164V
Powerprep 1: 163Q, 166V
Powerprep 2: 163Q, 166V
Actual: 162Q, 170V
Study regimen: scattered reviewing after class / work, over the course of 2 years. I really didn't focus my energy until the last 3 months. If you have the time, spreading things out can really help with retention. I used the standard 8 Manhattan Prep books (4th edition) for most of my studying, with some free Magoosh resources peppered in.
I would say that Manhattan tends to be consistently more difficult than the real exam, but this is more of a strength than a weakness. Quant problems tend to be more involved (require more steps to solve), but the content is otherwise very representative of what you would see on the exam. The vocabulary is not necessarily more obscure than what you would see on the real GRE, but the frequency of "obscure" words is definitely higher. Reading comprehension sections are very representative, but I've found that they tend to ask you to infer more than the real GRE would. Definitely take both powerprep exams; they are the best simulation of a real exam.