I see you already pulled the trigger, but I love my One so much that I thought I'd offer an opinion...
I don't know of a consumer product that I would recommend more highly (maybe my google chromecast b/c it's so cheap and easy to use). I'm on T-mobile and never have any issues with connectivity. I'm almost always on 4g LTE and the browsing speeds are excellent. As far as the phone itself, the thing is gorgeous and super durable. I refuse to put a case on it, have dropped it a bunch of times and it still looks new. The aluminum is not only what sets it apart in terms of looks, but contributes to the phones durability. I wouldn't test it on tile or concrete, but it has survived my hardwood floor. The phone feels great in the hand. It's slightly curved back makes it feel ergonomical and sturdy. There is something about the weight distribution that I like. It just feels right. This may sound like a small thing, but the One never slides around when I set it down.
As far as blinkfeed, I don't even know it's there. I can't remember as I bought the phone last April, but is it set as the default home screen? If it is, I must have changed the default. I only see blinkfeed when I scroll all the way to the left.
I only have three negatives. 1.) the camera is great in some aspects and only ok in others. It is rated highly in low light, but I completely disagree. The camera software is amazing, in particular the highlight creator which is awesome in concept and execution, but I've only had occasion to use it a handful of times. 2.) It doesn't work well with the bluetooth in my car. I had the entire bluetooth module and Mic in my car replaced and it only provided a slight improvement. I rented a car recently and it sounded fine. For reasons no one can explain (HTC, T-mobile, my car dealer) it sounds awful in my car. 3.) While I was on vacation, T-mobile didn't have 4g LTE and the data connection was unusable, but I'll chalk that up to the carrier's lack of network in the area. At home, it's more than fine.
It's too bad no one at HTC knows anything about marketing or the One would have been a game changer. I've used the Iphone 5s, the Galaxy S IV and while they are both more than capable neither compares to the One.