After half a day with it, I will say that I'm impressed. It's super fast, the screen is incredible, battery life seems to be great so far, and the overall construction is solid. Dinking around with the cameras, it seems impressive, especially in pro mode. The AF wasn't an issue for me, but I was taking still photos - it takes about .3-.5 seconds to focus, which is longer than people are used to with DPAF, but it's not BAD by any means. I get the impression from using it that it's going to be more of a tool than a toy, and that's not going to resonate well with some people who want instant results with no effort. The network speeds on WiFi are truly impressive - setup time to pull down my apps was FAR faster than any phone I have ever used, period. I was done with setup completely within 20 minutes; part of this is the download speeds that hit up to 250mbps down, but I think the largest factor is how fast things install once downloaded. I didn't make it out of the house yesterday, so I can't speak much to 5G (T-Mo) speeds yet beyond speed tests that show around 80mbps down at my house.
The downside is the sheer size of it. I cannot emphasize enough how LONG the phone is. If you wear any tight clothing, this thing will be a tough fit. In my completely unfashionable Costco jeans, it sits about half an inch from the top of the front pocket. It's not actually that unwieldy, and is a lot more comfortable to hold than the more top-heavy Samsung phones (e.g. Note and and Note 9), partly because they moved the button layout so you actually hold the phone higher up. Make no mistake, though - this is a two-hand device. Maybe a basketball player could use it with one hand, but not anyone with even normal large hands like mine.