We just got back from our first family trip to the World (April 19-24th). I attribute the success of the trip to Ridemax (and the DISboards, of course!).
We had a couple of small glitches, but they were not the fault of the software. We had a group of 12 (5 kids and 7 adults) with one of the kids in a stroller. I was a bit overambitious by selecting the 'Normal' touring speed rather than 'Slow'.
Regardless, we only had to forego Peter Pan on Monday (which we hit on Thursday) and the Maharajah Jungle trek at Animal Kingdom. Other than that, we had packed, fun-filled mornings and left each day around 1 PM after lunch when the crowds and heat arrived.
As far as the wait time predictions go: it was eerie how accurate they were. The longest we waited in any line this whole week was the Fastpass lines for Soarin' and TSM. (Both were around 15 minutes.)
I only used Ridemax for our mornings. I left evenings open for ADRs and casual strolling around the park.
I am a person who hates crowds and has little patience for waiting in line for things. I can honestly say that my family just had the best vacation we've ever been on. We were able to do more than we ever imagined, didn't fight crowds, and had ZERO meltdowns (my girls are 8, 6, and 5).
My wife and I were talking about how so many of the "magical" moments and interactions w/ characters were a matter of being in the right place at the right time. Ridemax allowed us to take advantage of those moments since we knew when we had time to search out a character or get that perfect picture.
I will definitely purchase Ridemax again when we take our next trip to WDW.

