Yup, you're not alone in those wonderings! Spring loaded 510 should definitely be a big plus, and the increased wattage should be helpful for most vapers - it certainly can't hurt. Ditto the lower resistance, and in fact that's one of the bigger plusses for me; right now I'm vaping a 0.07 coil in my IPV4 and I like that extra flexibility, which enables a lot more dual coil builds for example. My Aqua v2s are really designed for dual coil, but don't have the space for any dual coil build above 0.10 that I can think of.
The bigger screen is OK, but not anything I'm personally too bothered with. Ditto C temps, which might seem odd as I'm in the UK and I do all other temp measurements in C - but because all my vaping experience has thus far been in F, and I talk about it with more Americans than Europeans, I'm just sticking with F for now even though my IPV4 can do C as well. I've got a feel for 390 vs 420 vs 450 F etc, and can't be be bothered to re-learn the numbers for C, and doubly can't be bothered having to convert back and forth every time I discuss it with people
As for SXK vs Waidea, I don't know on that - but SXK are amongst the higher-rated factories out there. So the pedigree is good.
But the devil is always in the detail with these complex devices, and whereas we know the Waidea is now on revision 4 or 5 of the Kangxin line of chips - we've seen changes even throughout this thread, with newer deliveries/batches exhibiting slight changes to the earlier ones - this is presumably version 1 or at most 2 of the SXK/Infinite chip. So to a lesser or greater extent, new purchasers will be beta testing. It shouldn't happen, but it usually does with these new, cheap devices (and frankly, even with the expensive ones - looking at you, Evolv and Vapor Flask!)
That said, the SXK/Infinite chassis itself has been around for ages, so presumably is pretty solid - we would expect no ground issues, for example. Hopefully none with the 510 either, though the use of the spring loaded with TC has not been around for ages, so that's a possible doubt.
And that's a very good point, which I keep forgetting! I'm really, really hoping that this problem has not been replicated in the Infinite. And I feel there's a good chance it hasn't, because Infinite have gone back to the original DNA 40 to do their own clone. Hopefully they got it right where Waidea didn't quite. (And I'm now double checking that Geeco review to see if I can see evidence either way EDIT: I think it's fixed! See next post.)
Anyway, if you can hold out a few more days, then early-mid next week I can give you a full comparison between the Waidea and the 50W (or perhaps 60W) SXK Flask.
In the meantime, check out this video review of the Geeco 60W Zero clone. We know that it's using the same chip/board as the new flasks. I've not watched the whole review, but I skipped ahead to the pros/cons and the guy thinks it's very good. One of his main complaints was the non-spring-loaded pin, which won't apply to the Flasks. Another was the lack of a decent menu system, with so many complicated combinations of buttons, in and out of lock mode, to change stuff - but that applies to all the DNA 40 clones. Evolv cursed us with their terrible UI and the Chinese cloning crowd seem to feel compelled to replicate rather than revise it.
As one caveat to his review, he's not the most knowledgeable on TC in general ("I think maybe some TC mods only go up to 480? Some go up to 500°? But this goes up to 600°!" not sure I've ever heard of a real TC mod that only does 480°

) So he's perhaps not fully confirmed the finer details of operation.