My exposure is pretty limited, but

RCM Trainer 40 (Global) - good build, cheap hardware but it held up tremendously. One wing panel was warped but was easily corrected.

Big Stik 40 (Great Planes) - Appeared to use hot melt glue throughout Firewall pulled loose on one side that had not been glued at all. One wing panel was much heavier that it's mate. Had to add over an oz of lead to the tip for balance. Flies great. Would own another. Lost in a mid-air when a Hobbico Superstar Select pulled up from below to do a loop and clipped a wing panel, shearing my wing bolts. The Superstar landed unscratched! That must say something for Hobbico.

SK-50 (Kangke) - Oracote covering job was first rate. Good construction. Solid and light. Cowling appeared too flimsy for my comfort, so I added a layer of epoxy/coffee-filter laminate to the inside. Very well executed design and complete package.

Second-hand observations. Two Ultra Sticks (Horizon) at our club have had control rod failures - one catastrophic, the other found due to autopsy of the first. Superstars and Avistars appear to be well built and durable.

My biggest complaint with the small, sporter ARFs is the metric (and usually IMHO undersized) fasteners and linkages.