I use MBV too most of the time. They're solid on quality and they let us know what's inside the e liquid, being American made. I found out letting the MBV e liquids steep for two months (no breathing, just leaving it alone in the dark drawer) perfects the flavor and you get the maximum value out of $4.99 15mL bottles. I've tried many other pricier e liquids too, and so far I'm loving Rocket Fuel Vapes, Halo, Hurricane Vapor, Alpha Vapes etc etc. The primary difference btw those vendors and MBV (other than the price) is the complexity of the flavors. Most of the time the one-dimensional clean flavors of MBV's good enough for me, but time to time you wanna really indulge yourself in complexity of flavors, and that's when I go for those med-range priced vendors. All of the vendors I mentioned above have, IMHO, great quality and awesome flavors. My personal suggestions of flavors from each vendors are:
1. Rocket Fuel Vapes - the Reaper Blend and other any tobacco flavors they have, Limerick, Love Potion, and Rocket Pop
2. Alpha Vapes - Hoops, Heist, the Dude, Manchu (all of them are fruit flavors)
3. Halo - Torque 56, Candy Cane, Belgium Chocolate
4. Hurricane Vapor - Papaya milkshake, Mango milkshake
Again, these are my personal favorites, so you may or may not like them. FYI, I usually vape 24mg e liquids on 1.4 ohm rebuilt protanks or 1.2 ohm rdas on my mvp 20w at 9.5 watts all the time. If you subohm, I've heard people liking Mythos for their Max VG and thinner flavors, but that vendor I haven't tried so I'm not sure.