I bought those exact same bars last week for $80 CDN total at my LBS. I would suggest not buying used aerobars off ebay, only new in box.

If you live close to the city, forget about aerobars. But if you live like me just on the edge of the city where it turns to rural roads/farmland then these will be a big help. Hasn't been a day where I haven't used them.

The only niggly about installing aerobars is that you may have to get the addon computer mount that goes in the middle. I didn't have to because my DB4LW just fit right next to it and I added an extra extension arm so I could see it.

Set these up right, and they will be very comfortable, very useful.