Well...
I own a DaYi 6x12 back and found it really nice for the 100€ I paid for it. I admit it ripped a tear in one film once, but I think I just should have spooled the film more carefully, and apart from one nicked frame, the film came out fine. Don't know abut this one, but mine feels very solid and well-made, too, it's almost all metal, heavy, and the back closes with a firm and trust-inspiring *clunk*. No light leaks yet, either, and I loaded, unloaded, and shot with it in the Canary Island's sun last week. Haven't got any photos online yet because I just started scanning them, but they look great so far.
The advantage over shooting sheet film for me this time was that I also took the Hasselblad with me and thus was able to use the same film for both. That made travel a lot easier. I wouldn't have been able to fit a couple of holders and film boxes into my backpack along with the rest. Sure, this way, I only get negatives two times the size of the Blad's, but I took the 4x5 primarily for the movements and the ability to shoot panos anyway.
Antje