I have a few of the Joye 306's that I got because there was a good deal on them ($15 for 3 shipping included). They'll get me by, I do regret being so darn cheap; they pale in comparison (much less clean tasting and not quite as good vapor) to these and the extra few bucks wouldn't have killed me. I'm sure you'll be happy with both atty styles and I've heard really good things about that battery too (Don't have one yet, but I plan to get one or two myself at some point). Looks like the Vmod XL has catch basin/chamber which is a big plus if you use PG-heavy liquid. If you DIY your liquid, just make it on the thicker side; these atties (esp the 510) are monsters with thicker juices.
I don't know Alan's guidance here but would be interested.
I do know my cleaning method is officially advised against on the site
Still, I get about 5 weeks average from them and the performance is near-new the whole way. Again, my method is explicitly NOT recommended on the site, but it works well for me: rinse/blow/dry burn/repeat.
Should you decide to give that a go, just don't do it until the atty performance drops off, and proceed with caution. You don't want to get yellow/white, just a nice bright orange across the coil. You should read up on the routine if you've not done it before, and
also make certain you are not stressing your batteries or your device - any unusual heat (aside from the atty):
STOP.
The atties also stand up fine to a good boiling or coke baths; I just like the speed and effectiveness of the dry burn - for me.
YMMV