Ive got Innokin Jem and T18, and JacVapour S17 & S22,
The 1st Innokin Jem I had sometimes leaked but otherwise was great.
I then got a S22, very well made, never leaked, battery power really good (lasts me 2 days if I don't vape too much) there customer service is excellent however mine gives poor flavour when the battery power drops (so really only gives 1 days use-age otherwise no flavour) and regularly 'floods' the coil which means I hardly use it now and has stopped me trying the new Vim model. It gives better flavour with the new 0.7 turbo coils but ive still had the flooding issues. Like someone just said this comes with a wide drip tip, i'd go with the narrow if you like a tight draw.
Ive got a Jacvapour S17, again really well built, never leaked, light and I love the feel of it (a bit like having a cigar in your hand) fits great and light in your pocket, for some reason the flavour doesn't drop as soon as my S22 when the battery power drops, only issue ive ever had with it is the battery gave up after 3 months, and the new one ive bought seems to be getting weaker already. It comes with a medium drip tip, I bought the narrow which I prefer for a tight draw.
The Innokin T18 ive got is light and easy in the pocket, very similar to the S17, battery lasts well for its size, never yet leaked, flavour is good, similar maybe slightly better than the S17 but prefer the feel of the S17.
Finally I bought another Innokin Jem maybe 6 months ago, this one has Never leaked, flavour is great, better than any of the above, easily adjustable from 10w-13.5w, draw is adjustable and I find the drip tip perfect, light and easy in the pocket,, battery power great for its size (better than the Jac S17) its still keeping great charge now, I get a day if i don't vape too much, coils last ages
If I was to get another of these 4, for me it would be the Jem.
I smoked Golden Virginia, a pouch a week for 30+ years, nearly a year quit now, and have tried loads of liquids, especially tobacco flavours, and like the above post said, id be wary of some china liquid you've not tried. There is some crap out there that's nasty tasting and some that's very nice, if you can try some 'testers' and doen't necessarily go with the cheapest as ive found mostly you get what you pay for