As they say "You get what you pay for." But I've found the Modeltech planes to be a good buy. I'm still flying my Extra300 .25 and it's a little work horse. The main thing on these and several other ARF manufacturers is to REALLY LOOK OVER the plane carefully before slapping it together. Do a mock-up assembly to check wing and tail fit. Check for any warping Don't take any chances with your expensive motors and radio gear. Use plenty of 30min epoxy on high stress areas like the wing hold-downs and the firewall. Add tri-stick where it needs it. Plaster that thin CA around light/thin fuse sides and gear block areas . Let it cure good and apply another coat. Then build your plane. You won't regret it.
Sorry I don't have info on the SE5A. There is a good thread on it here in the ARF forum.