Well, if someone's still on the fence for this VS dna40....
I got one since the beginning of this week, and I'm absolutely in love.
I own a VS Rdna40 as well (large screen, end of 2014 batch, no dna40 issues at all, lucky me), and I've lately come to realize the 510 connector is the weak spot and the only problem with it (yes, modulo dna40 bugs...)
Just to be clear: the Rdna is a great device, but the 510 connector is suboptimal and not on par at all.
Since my first days with it (the Rdna), I got the impression it was reading base resistances constantly about 0.02/0.03 higher than my vaporflask and another dna40 mod I built myself.
I also asked about this to evolv and they replied they might have tweaked the firmware to keep some "offset" resistance into account, but it didn't really make much sense to me.
More doubts started popping out when I noticed that very shallow-510 attys (like a Squape R for that matter) were getting veeery inconsistent reading.
Then a look at the 510 center pin and some help from other fellow ECF-ers (thanks @tchavei), made me realize that Rdna's 510 center pin is quite recessed and the spring behind it is all but stiff.
So much that I'm planning to try a replacement as soon as I have the opportunity to try a different 510, but that's another story...
Back on track now on the newest little puppy, the VS (non R)dna40: this is a much-much-much better 510, apart from being SS (which makes threads much more reliable): I verified the center pin is about 0.5 mm higher and the spring is stiffer.
This has been fully confirmed by:
1) all base resistance reading are perfectly in line with my vaporflask and the other self-built mod
2) my squape R is finally usable on this VS (non R)dna and the resistance is consistent every time.
TLDR: if you don't mind missing wireless charging and the smaller screen, this is IMO a much better device.
Oh, and you can't believe how much smaller it is unless you try it, think eleaf istick, and you're there!
Hope this is of some help.