For pretty much all of my favorites .the first time I loaded them up, I was like ewww. but I definitely did a total 180 on my opinion after revisiting. I think that comes from mismatched expectations. I really have no idea what I was expecting, but now I always try flavor a few times over a few days before I've come to any conclusions... So don't toss anything before giving it another go

.
Oh and some flavors seriously stay in your atomizer...for what seems like forever. (Die Wyatt die!) So keep in mind that one lingering juice may taint your opinion sometimes
Favorites: (I have a few cartomizers loaded up with these and switch between them, mostly RY4 and 555).
* RY4 (freedomsmokeusa.com) mellow flavor, tobacco & vanilla or carmel type flavor. Sweet, and not sweet as in pure sugar but as in hint-of

..
*555 (puresmoker.com/vapor4life.com).mellow flavor, tobacco, and some kind of nut. 'Hint-of' sweet flavor. Vapor4life seems seem milder, but puresmoker costs more..
Tonic Curtis' Coffee (puresmoker.com) this one tastes like coffee and is definitely sweet but it grows on you. I usually vape 12mg or 0mg versions of this. The 0mg has a lot of flavor. It's the only 0mg that really has any TH. I usually mix it with a little 6-12 vg tobacco tho for some decent vapor. And I'm pretty sure it's like 90% kahlua, but it works for a good low nic vape.
Tonic Silverleaf Tobacco - (puresmoker.com) a more distinct tobacco flavor, but still fairly mellow
.
Pure Marlboro/ Freedomsmoke MarlbX - tobacco flavor, not too strong, not too distinct. Pure was more expensive, no real difference though imo.
----------.
Anti Favorites
These are flavors -I- would avoid. They all had a very distinct taste though so I can see how they could be someone's absolute favorite. I didn't like them but I tried to add some comments as to why though because .'one man's trash....
Wyatt Earp (freedomsmokeusa.com) very tobacco smokey flavor. almost cigar like. I'm not sure but I think it's like a hickory flavor.
American Spirit (freedomsmokeusa.com) very tobacco smokey flavor. but also very smooth. Like Wyatt earp, but smooth..
Cola (freedomsmokeusa.com) tastes just like coke. I drink a pretty insane amount of coke, but as it turns out I don't like to vape it.
Johnson Creek: Original>(johnsoncreek.com) sweet, medicin-y, tobacco-y. I actually liked the blu cigarette cartridges' classic tobacco' Flavor (before I had tried anything better) and I thought that's what this would be. It kind've is, but with a way stronger, sweeter flavor.
Freedomsmokeusa: CoffeeX> I have no idea why I wouldn't like something with coffee in the name, thats never happened before.

.
This is NOT like any of the 'cappuccino' eliquids I've tried. apparently the milk flavor component is crucial to whether or not I like a coffee flavor. CoffeeX is very bitter, very distinct. If I had to relate it to coffee at all, I'd say burnt coffee. So if your looking for a mellow coffee type flavor,this really isn't it. But if you like very black coffee or something this may be right up your alley.
------
Others...just because my post is this long might as well review the rest of what Ive tried.
Freedomsmokeusa>Chocolate: very mild chocolate flavor, a little bit sweet. Smells like a Hershey bar, not that sweet though when vaped. Would probably be fine to add to tobacco/coffee flavor..
.. ..
Freedomsmokeusa>Cocoa : also very Mild, chocolate/cocoa flavor. Like chocolate but without the sweet aftertaste. would probably be fine to add to a tobacco or coffee flavor.
Vapure: Tobacco (VG) : This one -was- one of my favorites. Its actually super neutral, a little bit sweet in an ry4ish way but without any particular sweet flavor. But i mostly liked it because its very thick, and makes a great base for other tobacco/coffee flavors to add vapor and so they don't .just drip straight through a cartomizer. Unfortunately they don't offer it anymore, and changed their main flavor to Dry Tobacco. I haven't.tried that one yet. I wouldn't think it would be all that different, but who knows.