
Good choice, the 510 rocks, I haven't bought anything from that particular supplier yet so I can't comment on that part but I can say that my 510 is still kicking about the same as it was when I first got it a month ago, better than I can say about my 901's who's production seemed to begin to decrease after about 2-3 weeks.
As for other stuff (accessories... my $0.02)
USB chargers:
an absolute MUST for me. I carry a USB charger for each of my e-cigs in my purse at all times that way I'm never without a fully charged battery.
PCC:
I wasn't really impressed with the PCC honestly, I just prefer using my USB charger, I always have either my work pc, my laptop, or my car cigarette lighter to USB adapter handy so it's not something I really use much though I can see how it might be handy for someone with a less techy life style.
Cases:
In looking for cases I found that Innovaper has a really kick*ss case that suits all of my needs 100% perfect (great customer service from those guys too)
That's about all i have for you on the 510, since I've received mine I've been more wrapped up in juice than anything else.