I vaped tobacco flavored eliquid for 4 years approx. Got tired of the price, and heard about unflavored here. I picked up supplies close to a year ago to get into DIY and never looked back.
I mix mine around 50/50 (sometimes 60/40 or 40/60) but usually 50/50 is my sweet spot. 9mg strength. I find that it is not truly flavorless, but it leaves no odor which makes it a great stealth vape, and a great vape in the house when you don't want additional smells around. I love the taste of it, as others have said, it's a little smokey?, peppery, and sweet at the same time. It's been so long since I smoked tobacco I honestly can't tell you if it tastes like that because I can't remember. It's subtle, clean, and smooth.
I don't see myself going back to flavors, tried a few and none of the berries, cocktails, custards, etc appeal to me. HUGE upside is the cost is peanuts compared to B&M or online pricing of regular flavored eliquid. Bulk supplies are a bit of an investment, but once you have a few litres of PG/VG base and some nic base, you can make it up as you need. I keep everything in the freezer except for my daily use bottles, and a 120ml refiller for my droppers. I mix 1L batches, portion into my large refillers, and take out a 120ml whenever I need. Stays fresh and works WONDERS for me....
If you haven't tried unflavored yet, DO IT.