Mine is Bush Hog brand 6'. Can't say I'd recommend it over a TSC or generic brand. Not really heavier and I managed to chip/break/angle every tooth on the rippers. Ratchet strapping a 5' on top of it to almost double the weight made it work really well. PIA to deal with that contraption, but made it work like you think it should, cutting in places it wanted to skim over.
Depends on what you want to do with it. Just light gravel road maintenance, a general purpose one is fine. If you really want to do some cutting or not worry about buried rocks breaking stuff, probably worth the wait or extra $ for a truly HD one (I say it that way since even the crappiest are called "heavy duty" in ads frequently).
It is real easy to add weight to a lighter one though to make it work better. Simplest I saw was bent rebar welded on to hang basic plate weights (like from a home gym picked up cheap at a yard sale).