Pros w/ a 510 would be increased throat hit, cartomizers available, etc. Cons would be less flavor from atty, less batt life from a stock 510 batt (not counting Mega batts or the Ego/Tornado), etc. BTW, the smaller joye 306 has an exposed atty and is compatible w/ 510 parts.
I like my 401 for around the house
vaping but use the KR808 for out and about due to larger cart capacity. Maybe the 510 would be the way to go, lots of places carry parts, yet another pro...