I let a female friend of mine listen to my sennheiser hd 25 1 ii and the beats studios/pros side by side.
Her impression was she liked the beats pros more. I asked here why and she couldn't put a finger on it. She then said that considering the pros cost $450 and my senns cost $199 she couldn't see anyone buying beats pros. She said she didn't notice much of a difference.
She thought the studios looked cheap.
I bought my gf a Monster Beats Solo and an Audio Technica ESW10JPN. She thinks the ESW10JPN sounds more natural but she prefers the Solo. The reason is that the Solos have less treble and sound warmer. My gf tends to listen very quietly and Solos are much easier to listen to for sensitive ears. Sucks though since the ESW10JPN costed me $650.