Its like sweet air.

I agree. I have a tank permanently filled with flavorless. I vape it around 20% of the time, sometimes more, sometimes less. I find it is a great palate-cleaner - vape flavorless a little while, and your flavored juices taste much better. I don't just do it for that though. I like flavorless. As you wrote, it's smooth and satisfying.

Yea it's great! I vape unflavored in my Kayfun as my ADV, finished flavors I've made in my Cats as a "treat" if you will (at home, out with friends, after a meal, etc), and test out new flavor recipe ideas with my Magma by dropping single pipette drops of flavoring onto the wick followed by drops of unflavored (two in one use for my bottle of unflavored!).

The two main reasons why unflavored is my ADV is to reset my taste/smell like a few of you already mentioned, but also since flavoring is one of the last big unknowns for vaping it helps me minimize any POTENTIAL risks.

Which brand do u use?

when i got my first vaper I ordered a 120ml bottle of pure PG and had to vape that for about a week while waiting for real juices to arrive.
and i can say that I did get into it. it has a sweetish taste that's not overbearing. i dont see any point puffing it without any nicotine though.

been vaping vg with a smidge of nic for a few months now, it's been good to me.

I vaped unflavored VG with 2mg/ml when I had a molar extracted the other day.

I didn't want to create suction in my mouth so I vaped that day through my nose :D

You know, that's a really damn good idea. I'm definitely gonna give this a try. I may actually try adding a couple drops of Ry4 double and see if it gives a tiny tiny hint of carmel/Tobacco to it.

I'll vape through 15ml of "plain" from time to time.

Try adding a little bit of ethyl maltol.