I agree with the other posters, try several vendors, and a variety of flavors in small amounts first. Because:
1. Flavors vary between vendors.
2. Eating something does not mean you will want to vape it all the time. I love pistachios. But pistachio flavor e-juice was TERRIBLE!!!
3. Flavors that you like to vape today, might get old for you tomorrow.
4. Flavorings are the least stable chemically of all e-juice components. Over time some will decompose. 500 mL at 2 mL/day is 250 days, and it is possible the flavor will not last that long...even unopened and still sealed stored in the fridge. Fruits are notorious for this. Depends on other things in the juice too, added by the vendor, like water.
5. E-juice sitting for a very long time in plastic will eventually start leaching plastics into the juice. This is even with unflavored nic-juices. Don't buy more flavored juices than you can vape in 2 months, and store them in plastic.
6. With the disappointing flavored juice purchases, and great uncertainty in whether I would like them in the first place, I make all mine DIY now in small amounts, enough to vape in a couple weeks or so. MY recipes = my preferences. Takes some time, but I know what is in them, and its a lot cheaper in the long run.
Just my $0.02.