Thanks! Very helpful post. My #1 fear of the 1520 is it being too big. I already know it won't fit in my car's cup-holder and I think that would be annoying over time. Getting it out of my pocket in a rush would probably also get frustrating. The ability to change the 830's back plate cover, although some might find silly, is also enticing.
You're on T-Mobile - in what area of the country? The final concern I have about the 830 is the RM-984 not being full LTE. I'm in the Saint Louis area and don't want to be let down by coverage or performance for audio streaming and the like. You seem to be getting great performance with the RM-984. Is there a way I can tell ahead of time that this won't be a concern for me and my wife? I'm on Sprint now so I am unsure how good T-Mobile is around here. Their maps claim to be 'excellent' but who knows.
Thanks again.
Yeah, you get used to handling it, but that doesn't mean it gets any smaller, if that makes sense. You adjust to it, but it's a bit of an inconvenience depending on how big your hands are, the clothes you wear, etc. I'm 6'1" with proportionate hands (not huge, not small), and though I could scroll and swipe through things with the phone resting in my palm and my pinky underneath for support, it was annoying having to strain my thumb to reach all the way over to tap something on the opposite side with just one hand.
I'm in the Washington DC suburbs (northern Virginia), but was actually in St. Louis over the summer for a friend's wedding. I was using my 1520.3 with LTE at the time though. Coverage was good overall, but spottier in the western and northern suburbs. Coverage is actually about the same here as it was in St. Louis... maybe slightly more uniform. What I've found is that signal strength/download speeds will never be as great as advertised on TV... you'd have to be right next to a tower with very few people using the network at the time to reach those speeds. Real world testing has shown 0 difference between HSDPA and LTE speeds for me, as mentioned. I know that's a little surprising, and I'm not sure what the reason is... I mean, HSDPA is fast to begin with, but I'm thinking the fact that LTE networks are a bit more congested these days might be part of the reason.
T-Mobile's LTE network is catching up fast, but their HSDPA network is already well-established. I can't imagine you not getting good H and H+ speeds anywhere that you already get LTE on T-Mobile (including St. Louis).
I really don't think you'll notice any difference at all between the RM-984 and RM-985 as far as data speeds, but if you're not quite ready to order immediately, maybe you can wait a few weeks to see if some unlocked RM-985s (non-prototypes) show up online. It seems they've already been shipped to Canada (locked to Rogers though). T-Mobile's network as a whole though is spotty. Not as bad as Sprint's, from my experiences, but definitely not as good as AT&T or Verizon. So, streaming music might not always go well depending on how far away from the city you stray, but that won't be a function at all of LTE vs HSDPA. I stream video flawlessly on HSDPA, as perfectly as I did with my 1520.3 on LTE. It's just a matter of where you get service and T-Mobile's HSDPA network is at least as vast as its LTE network currently.
Your other option, if you want LTE on T-Mobile, is to wait for the AT&T version to come out November 7. It should run on T-Mobile's LTE network as well. Two points of caution though: 1) Unlocking a device through AT&T has become almost impossibly difficult if you're not a customer. 2) It seems AT&T will only carry the darker variant, which means you won't have that beautiful silver-colored metal band to go with those different back covers. It'll have the dark grey/black metal band that (in my opinion) really only looks best with the black back cover (which is probably why Nokia/Microsoft only include it with black Lumia 830s).