i would buy them just to have friends compare them to better cans... however they are overpriced and cheaply made.
the plastic is cheap as hell and they are easily broken (the exception is the Beats Pro which are built like a tank)...
the sound quality on all of them is mediocre at best (regular beats are easily outperformed by $80 dollar grados). muddy bloaty bass which isn't even all that good, recessed mids, virtually no highs... the beats pro sound a tad bit better (compare to hd 650s sound signature but extremely recessed mids, and an overall dryer and muddier sound as well as being less dynamic.) but definitely are not worth the $400 dollar price tag as any audiophile can over 250 will cream them even if you amp the beats and play the audiophile can on an ipod.
finally, they aren't the most comfortable cans, they are mostly a fashion accessory like skull candy and are expensive because of the dr. dre label/style
people only buy them because they are uninformed of higher end products which best buy and other major retailers don't carry.