I look forward anxiously for your report iBloke. P3 is a good thing in my mind, it has a few useful features above and beyond the Classics capabilities. One of which is the highly contested IQ function, which in my mind is a plus, as I use it to check my pool of batteries condition, and cull those that are ageing and no longer up to snuff.
G'day matey
It's arrived, and I've spent the arvo modifying my kanger top tank positive pin so it sits flush on a P3 connection.
Prior to this there was about a .5mm gap
Yes mine has version 40 software, including the boost function...so I'll be reading the P3 manual to glean as much info as possible.
And YES I have the option of going to 20 watts just like the P3
But without having completely read the P3 manual yet I can't say what is different..if anything.
I also added an extra extension to my order for $8 which means I can use 18350, 18490, and 18650 batts.
Currently loaded with the AW18490 that I also ordered, but will be buying an 18350 in the near future simply for the short footprint.
I bought the Classic with my kanger top tank mini in mind, which has proven to be a pretty decent tank with it's mini RBA, apart from a small amount of leaking caused by user error
The cheap and crappy kanger Kbox mini that came with the "starter kit" has "broken" twice since buying it, so it has now become a door stop. Literally.
Anyway, I'm stoked my black kanger tank with red O rings is now functional again atop a beautiful Provari black/red Classic!
I rebuilt it this arvo with a 2ohm coil (I meant it to be 1.8ohm but messed up a little
)
oh and here's my Provari family photo's LOL
stiffy
it kept going 
Well, you know ProVari mods do like company, so yeah, you had to do it! 
