i'll start this with "i love my dragonfly".
i would not call the dragonfly a "classic" sound. in fact, i'd call it the opposite--a unique sound.
it's a mic that doesn't work on everything, but it seems to excel on stringed instruments. it's an *awesome* mandolin mic. but it's VERY picky in terms of placement. you really need to take the time to get it placed right. i'd love to try it on cello.
in terms of acoustic guitars, i find i have far beter success getting a great sound out of it when i'm recording someone else (and not myself).....making those "fine tuning" placement tweaks with that mic is paramount. and i can't do that too well when recording myself.
on vocals, it either works or it doesn't--there's really no inbetween. and when it works, it *works*. even if you don't like it once on a vocalist, try it again on another song--the mic's timbre might be right the next time.
i love it on guitar amps and on snare drum. due to it's large head, though, i'm usually resistant to use it on a drumset snare.....but in recording "concert snare" type work it's quite nice. it's also an excellent overhead in those cases where you don't need to downplay the cymbals (good room, good cymbals, good drummer).
i don't like it outside the kick. it's interesting on a bass amp and can provide a nice coupling with a "bass mic" (d112, beta52, etc).
given it's interesting aesthetics, it's got that "cool" factor, which sometimes helps raise the game of the performer. no one thinks an sm58 is "cool" looking, but everyone seems to want to sing into the dfly. the MXL V67 seems to have a bit of that going for it too.
if you're looking for an "all around" mid-price LDC to add to your collection, I'd direct you elsewhere......prolly towards the 4050 or KSM series. this would not be a mic i'd recommend to you in the event of you only having 1 or 2 mics.
but if you want a mic with a unique tone that you'll love once you get used to using it, or if you're looking to increase your sonic palate, or add another quality mic to your collection.....go for it!
cheers,
wade
PS--do a search around here for "dragonfly" and you'll find a LOT of thoughts on it