I have to admit I wouldn't trust those flimsy ones you get with kits. I had a lot of climbing ones spare so I used those and I always hang everything with strong chain.
I've had 6 tents. 2x2m and 8x4ft been the biggest and all were strong, but they were 18 or 19mm poles with steel corners ect, not the 12 or 15mm poles I have seen on some with plastic corners.
Its probably a bit like buying a mars hydro light. 3 guys might be lucky and they don't burn out but the 4th guy has a failure. Its a quality control thing I guess.
I would be confident doing pull-ups on my tents but not confident enough to do hanging sit ups..