I have an M-401 (Sinless Smoke...I know, no one's heard of it lol). I have been going nuts because my charger is en route from my mom's via US mail, and it's taking FOR EV ER. So a friend of mine gave me a Blu today, and maybe it's just cuz I'm fiending like a ...., but I personally like it. True, I'm pretty much a beginning vaper, but so far, it's not bad. It's smaller than my 401, which lets me hold it like an analog, and it seems to put out decent vape. Then again, like I said, I don't have experience with anything but these two. I plan to get a 510 in about a week, I'll see how that goes and make another comparison then.