The recent $60 bottle cage thread received a lot of attention, with many different opinions. I see people all the time with nice modern bikes outfitted with POS bottle cages. Here's a case for buying quality cages:

Our regular Saturday morning club ride this time of year is really a great ride ROUTE MAP. The ride is about 75 miles (from my house) and it skirts around the valley perimeter on the way out and includes a climb up a distant canyon. The canyon has four or five cattle guard crossings that we take at full speed coming down. There is a re-supply/re-group stop in the town after we descend the canyon. A few miles after that stop there is an elevated railroad grade crossing that is not very smooth.

On yesterday's ride we had about 15 people of very mixed abilities and experience levels. As we made the rail crossing after the stop (with bottles completely filled of course) I get torpedoed by a bottle from the guy in front of me. Well, we weren't going fast so I stood my ground and rode over it and crushed his bottle. Everybody stopped while he seemingly lamented the loss of his bottle. Personally, I was just glad it didn't throw me for a 10 count. He only had one bottle now, but it wan't a hot day and he'd be fine to get home. But, I was thinking about what if that had happened a few minutes earlier at 30+ mph coming down the canyon as we crossed one of those cattle guards?

So my point is simply this: Make sure if you ride with others that you are responsible enough to have bottle cages that have sufficient holding power to restrain a filled bottle when you hit some big bumps! I see a lot of crappy cages on nice bikes. Also make sure there is a secure fit for any bottle you use!