I got one of the latest Vision Viva Nova v2.5 tanks from GotVapes on Thursday and I'm loving it
It is based on a CE2 type of head that is replaceable ( or rebuildable for those more ambitious of you ). 3.5ml capacity, currently they carry 3 different ohm heads, 1.8 ohm, 2.4 ohm and 2.8 ohm ( it comes will all 3 btw ). The brighter flavor notes are really accented and these are not muted flavors like a polyfil carto has ( at least for me )... The head are super easy to clean and dry burn so they work like new again up until they finally wear out ( not sure how long they last, a Stardust which uses a similar head, I've hear can last months ). I haven't had a single problem with leaks on this at all.
I had also tried the v1 Viva Nova, these did have problems, almost no flavor and the heads had serious QC problems... these problems were all addressed on the latest version... BTW, if you got a VN v1, the new heads fit on it also...
Speaking about Stardusts... they are about to release Stardust 2.0 ( do not confuse this with v2 or v3 which are different revisions )... These will also use the same heads as the Viva Nova and will about a 1.6ml capacity and fit nicely on eGo sized PV's.
These have been the most fiddle free vaporizer I've used to date... Clean, clear unmuted flavors like many CE2's have. They disassemble very easily for cleaning, I'd say almost stupid simple almost even... They do accent the higher note flavors more than the lower ones and some may not like that.. but that is the only concern I have and it isn't a big one to me.
Randy