I have the Beats Solo HDs and I love em. I would recommend those because they come with 2 audio cords, one of them has the volume control and mic, so you can answer calls with it. They aren't huge, good travel size, and they fold up and also come with a little carrying case.
The regular Solos have heavy bass on songs that don't necessarily need it. I've owned both and would say it's better to pay a little extra for the HDs.
I don't regret my purchase but like others have said, you can find a similar pair for cheaper and at the same quality. My first pair of Beats were the in ear iBeats, they were good quality and cost from $100-120. They have a steel encasing so no sound bleeds out for anyone to hear what your listening to. My only complaint was that the volume control/mic was a weird triangle shape and felt like cheap plastic. The headphones eventually broke and i exchanged those for some Solos, and eventually Solo HD over the ear ones. I still wanted some earbuds so I bought some Skullcandy Titans and the sound quality is the same,if not better than the iBeats. I only paid $17 on their official eBay store too. They don't have a mic/volume control, but there are models that do.
So if you really want to own pair of Beats by Dre, go for it...they're quality headphones, and they got nice design to em. but you can find some just as good for cheaper.