Yeah, when I was looking for a bike I came across the Tekiya, and had a look at some reviews for it. I didn't see a single positive one either, and everyone who'd had it had snapped the frame after about 3 months. Just hope it holds out for you
I actually don't know anyone who likes Diamondback, I think they're a kind of "jack of all trades, master of none" kinda thing, as they make bikes for a lot of different things, but apparently, they're all shit.