I got maxonform and I've been playing around with it for a couple of weeks now. I think it's a great add on for AC. It was quite tricky at the beginning but I looks easier now after a couple of weeks of using it. You can make quick adjustments to AC elements, and that's one of the reasons I find it very useful. I believe it's a must have software, it makes AC so much easier. Just don't forget that it idoesn't have a rendering engine like Cinema 4d does, but if you already got C4D, you can just get a plug in for AC.