To qualify my comments, I started vaping with only Halo e-liquids and then jumped into the DIY thing soon after. I just bought/got 3 from MBV, started steeping them after a small sneak of all three at 2 days old. Sneaks showed good possibilities, time will tell.
Halo Twisted Java I guess gets the worst vape spot. Don't like the flavor at all, and I have been a coffee fiend since my youth. Halo Shamrock gets #2 - not obnoxious, but it did nothing for me when I got it, is the same 4 months later.
Easily the worst "ordor wise" was my first DIY Coffee attempt - Irish Coffee. Started steeping and it was soon apparent I got WAY too rambunctious with the Keoke Coffee in it (or so I thought). I didn't try to vape it until it had steeped four weeks and the smell toned down some. Was shocked it is actually not bad. Mostly get the coffee (not too strong despite the smell), with a mild Irish Cream follow and subtle sweet aftertaste. Not an ADV yet, but it has possibilities.