Sorry I can't answer your specific question, but my buddy's DPM Ultimate 40 broke the forward cabane attachment point (on the underside of the upper wing) fairly early; he had like maybe 20 flights on it total.

He's still waiting on the part. From what I've been reading here regarding DPM "support" after the sale, he may be waiting quite a while longer. Too bad, because it is really a nice model. I would like to have one. But I think I'll pass, in favor of some company who returns calls/messages.