Well, as far as I understand (in a nut shell) - which I don't have 510 myself, but I've contemplated on getting one for a longest time and read many reviews:
Pros:
1. Better vapor production / throat hit due to hotter running 4 hole
atty, longer cut-off period, and of course, manual switch option.
2. Cart holds more liquid than 901. (And they do have less leak, as I've tried myself on my SD)
Cons
1. Battery life (much shorter) - you'd need extra batteries, or
PCC.
2. Taste - compared to more pronounced taste on 901, I hear some of the weaker tastes do get lost.
3. automatic batteries is also very sensitive to sound/vibration, I hear... I wonder they fixed the problem. But I think manual is indeed the way to go with 510s...
Now Ruyan Direct is selling 510s and attys at 6dollars each - I do think it's a good option to go with. I might get one myself for socializing, or flying purpose - as SD or any mod does look rather... pipe-bomb like.

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