For flavor I prefer the 401 over the 510 and the
throat hit is fine as well. The vapor is not quite as thick but it's plenty. Everyone has their favorites but for 3.7v
vaping I prefer my Dragon/m401 and at 6v I prefer the 510 that's when the flavors come out on that.
You were given some good advice though to not play around and get that thing back ASAP, you don't want to get hit with stupid charges for that thing. I believe those 14 days started from the day of the order, NOT the day it arrived. Check the fine print, one of those "free trial" scams offers a trial period but it starts from the day you order, so be careful. It only takes a couple of days for a m401 or 510 or whatever your going with next to arrive, I would just pack that thing up and send it on it's merry way.