i'll tell you how
I knew... that's where everybody gets their Rivas. they'll be real nice at first. after you have to keep having things replaced over & over, they get a little less nice.

i don't know if my Riva kit (plus 2 separate
batteries) were just from a bad batch or what, & i figure they probably were, but after a while i don't know if i was sicker of them, or they were sicker of me. if not for the
mods, i was thisclose to going back to cigarettes. that's how frustrating the whole experience was for me. i had to replace 2 attys & the replacements failed as soon as i got em, 1 charger, & probably like, 6 or 8
batteries. like i said, i lost count. one that i sent back,
after they told me to, they refused to replace or return to me, because they said the warranty had run out. they said they'd send it with my next order if i asked.
as if.
fool me once, shame on you. fool me twice, shame on me.
(btw... the 901 is just the KR8 version of the Riva. 510s are basically the same thing. they just have different connectors
just about everybody works their way up to mods eventually anyway. when i talk to anyone who is interested in e-cigs, i tell them to skip all the working up, & start with a mod in the first place. save yourself the aggravation.
but you know, that's probably just me.