I bought a set after I noticed Midway had 'em, right after I sent my C&R in for the dealer discount. I like 'em, but I had a little trouble with the 1st Samco stuff to stick on them.
I got the flashlight mount for the streamlight, and the bipod mount. Both were incredibly tight when I tried to mount them on a regular picatinny rail...so I made a slight alteration (filed down) the end of the little metal piece that the pushbutton moves. It was still tight, but I could at least get the damn things on the rail.
When the M44s showed up (ordered from 2 different places), of course the stuff I tweaked was a little loose...front to back, which was not what should have happened based on what I was filing.
In any event, the vertical grip I have mounted on there...the one from ACE, Ltd, seems ok, but I notice if I pull/push on it with any degree of force, it will move...it looks like if I continue, I could rip the thing off the rail.
Based on that, I don't know how sturdy they are. They do feel comfortable with the panels, on, I'll say that. I will probably order another light mount before too long, to put on another rifle. If the unaltered one fits better on the M44 handguards, then I'd give them a little better rating. For light duty, they seem fine...don't know how they'd hold up under "field" conditions, though.