Quant is tough, Verbal is a fair indicator

As the word-on-street is, Manhattan CATs indeed have tough Quants but fair verbal sections.

I have consistently score Q45-47 in Manhattan vs Q49-51 in GMAT club tests and Q49 in GMAT Online test as well. Specially the DS section is brutal in Manhattam. But dont think that more the difficulty the better you are prepared - even after taking 6 Manhattan CATs, my Quant score did not really improve, whereas my Verbal score did improve from 30s to 35s. Manhattan Verbal is a fair game and lands in same range/ difficulty for GMAT/ Kaplan/ GMAT club.

Still I would suggest Manhattam CATs because (1) they are cheap (2) prepares you for tough Quant and time management

Manhattan has 6 CATs, which you can reset multiple times. I personally have reset it twice, maybe even more are possible