I have the Trio 43 with a decent number of pedals on it. I did see some flex initially but on the left hand side, I have my ES8 top-mounted using the plates which seems to reinforce it somewhat. On the right hand side, I mounted my Zuma power supply underneath which did the same on that side so it's certainly avoidable. I did get some chipping of the paint but it's largely from trying to line up the plates....the little circular part on the underside of the plate scrapes the paint around the hole. I've the patch bay and IEC modules (which Temple Boards in the UK kindly mounted for me pre-delivery) and never had any problems with them. All in all, no complaints here.