So, I guess this is kind of a collective review, since I've tried quite a few "flavors"(?) of these masks. I'll review the Bulgarian Rose because that's one the I've been using recently. In addition, I've tried Pearl Powder, Black Pearl, Aloe, etc., and several more exotic varieties that my cousin got me in China. The only one I didn't like was the Aloe mask, but I suspect that might be more of a quality control issue, though all the masks I've used are definitely legitimate (note to potential buyers: don't buy the fake stuff! quite a few bloggers chronicle the difference in packaging between real/fake! I would be wary of putting the fake masks on my face...).
In terms of these different flavors, I have not found any significant difference worth mentioning. Except the scent, I guess; the scents are light, not bothersome, some quite pleasant (then again, I'm not sensitive to smells, so your mileage may vary?). I know some are supposed to be more hydrating, or firming, or brightening, or whatever, but I suspect that's more of a marketing gimmick.
For the record, I have very non-sensitive, oily/normal skin, not at all dry, no major skin conditions, etc., so others will have different experiences.
Anyway, I quite like the masks, though I don't use them often (keep forgetting...since they sit in my refrigerator; speaking of refrigeration, my cousin claims this makes them last longer..not sure about that...). I find them quite refreshing---this is main reason I use them, heh, when I'm feeling tired and my skin feels a tad dry, they are a nice pick-me-up. I usually leave on for 20-30min. They're also quite hydrating (for me...if you have super dry skin, they might not be sufficient), and they do impart a nice glow-y radiance to your skin. HOWEVER, it's definitely a temporary effect. Don't expect the luminous skin to last...unless you use like 2 a day...Don't expect it to magically fix all existing skin problems either, alas (although when I had somewhat inflamed acne or minor redness, it did tone it down).
In terms of fit, obviously the mask is not going to suit everyone's face. I found it a rather poor fit for me, to be honest, but it's hardly a major problem.
As aforementioned, I get these via my cousin in China, so they were pretty inexpensive. Since these are an inessential part---a nice bonus for me, but don't perform truly important functions---of my skincare routine, I probably wouldn't want to pay much more for them (I'm not sure what the markup in the US is...I hear Wal-Mart carries them at a reasonable price. I also saw them marked up to $20/box of 10 at an Asian grocery store...not sure if worth it for me).
TL;DR - 1) I like these refreshing masks. They are good for what they are: MASKS, so effects (hydration/brightening/reducing redness/whatever) are not supposed to be long-lasting. 2) Didn't notice differences among various flavors. 3) Be careful of buying fakes!