I have the Q-Strap but haven't really used it much, but it is nice to use.
What body/lens were you using?
I don't have any heavy lenses (heaviest is the 30mm) so body and lens only weighs 1kg for me at the most! Hence the reason I got a cheap strap.
But yeah, if I was using anything much heavier, I would invest in a better made strap.