ilima makes great points. I tend to not like them. They are heavy IMO, and many riders use them way to much on group rides. Most organized rides say no aero bars. That said they work great, allow more positions and a more aero tuck to maintain speed as a solo rider. They bike can be harder to control and shifting requires you to move (unless using a TT bike/bar setup).

I decided to leave them off my Madone (I ride 90% of the time), but do have a set on my Bianchi, with 50mm carbon rims so it's setup like a TT bike. The Bianchi is heavy, but fast on a flat TT and fun to ride. While the Bianchi is AL, my Madone is carbon and about 5 lbs lighter, so just an all around better bike for most of my riding.

I would borrow a set and see what you thought, if you like them go ahead, you can always take them on/off for different rides.