I only have the warthog. For the size of the RC car itself, its pretty accurate after having considered all of the crap they had to put in it to make it work. It has a slow acceleration but it gets moving pretty fast. It's a neat little RC to have and I like it alot.
My only real beefs with it is that the turning on it sucks at full speed, it hardly turns at all. The only other thing is the scale of it with the spartans it comes with. I should probably give it a new paintjob as well, might make it look much better.
I was at a toys r us last night, and they have now the mongoose RC. I didn't get it, but the size of the mongoose itself is actually the same scale as the Mcfarlane toy's version. This works out I guess, cause my issue with the mongoose is that the spartan figure on it is severly undersized. So I guess if you get it, you can smack a spare mcfarlane fig on it, and call it a day.
