I've only done the free Quant section from 800score and I do not think it is harder than the real GMAT, nor it is a good representative. The real GMAT focuses on number properties and exponents mostly.
The only harder Quant out there that I know of is MGMAT and the challenges. Everything else, including GMATPrep needs to be updated to catch up with the real thing.
Chinese Democracy is misunderstood...at your nearest BestBuy.
Best AWA guide here: how-to-get-6-0-awa-my-guide-64327.html