Since the question IS about trusting a vendor, rather than about flavor recommendations, I'd suggest that
AEMSA is a good place to start. It's an association mostly of juice vendors, who by joining are indicating what seems to me to be a sincere dedication to quality control, etc. Click on "members" and you can see all the juice vendors who've committed to this
ten page list of standards.
Since you mentioned fruits, I'll recommend NicQuid, who's on that list, and so far, the only SWEET juice I vape (I love their strawnana smoothie and banana bread) - I usually go for tobacco's!
It doesn't seem widely adopted, but I like the idea...
Thank you so much for all these suggestions....its much easier to narrow down some vendors to try now.
Any advice on finding a trustworthy shop? I'm from Albuquerque and we have quite a few here. I worry that its someone who said "Hey I think I'll sell this stuff even though I have no clue what I'm selling"...any triggers I should be looking for that should tell me I'm in the right or wrong place?