yea i'm in the process of using Cash-Crop and xtreme nutrients with a month left. This has been quite impressive and easy to use. I agree with you 100% about the xtreme grow doubling height in a week.
The only downside is the price of this line is expensive, mostly because of how broken down and ready to use the nutrients are which ive been told also flushes easier at the end.
I'm in the process of figuring out if it is cost effective enough to run compared to some other things.
Also i've been having a hard time finding grow logs or anything from people who used it. Know of any?