I'm thinking seriously about getting one. I had the M8 and the M9, and liked them both fine. Biggest issue for me is that I'd have to buy directly from HTC since TMo doesn't sell them anymore. I'd also consider an iPhone 7. That's if I have to give up my Note 7. No other Samsung phone interests me, nor does the Pixel or V20.
You get a free Desire or Re camera now. I'm always getting stuff for discounts on them though. Off I decide to buy one I'll just wait on another.I'm in the same boat as you. I really wanted to get the HTC 10 and am annoyed that T-Mobile no longer sells it. They never even carried it in stock at any of the stores where I live. I was looking at buying it direct from HTC; I guess they had a special for $150 off but apparently it ended yesterday. They're still advertising it though, but when you go to your cart to purchase it you see the full price.
HTC is what I'm leaning towards right now. Loved loved loved my M7 to death (literally). Alternatively I wish the Moto Z was carried on Tmo but of course not. The pixel was a huge let down for me otherwise I would have scooped that up.