I've been pretty curious, if for nothing but the price points. Seriously competitive.
It's a bit harder to make educated decisions before buying any one of these, since thorough reviews are harder to come by. I really like reading reviews from GSMArena and AnandTech, but they do mostly the bigger brandname devices a lot more than they do the newer manufacturers. Without reviews from these folks, I'm finding it pretty hard to risk my coin for any of these, as attractive as they look in terms of specs-for-price.
One of the phones that recently caught my eye is the Asus ZenFone 6, but I'm seriously reluctant to buy it. I rely a lot on thorough reviews, esp. for battery life and camera quality. Since the ZF6 is at the same price point as, say the Xperia T2 Ultra (which has a GSMA review, btw), I'm more likely to go for the phone that's been thoroughly tested. :/