My Miyata 1000LT has them. I got them because they were different, I saw a lot of people having them on their bikes and got the feeling people were happy with them. So when I rebuilt the M1000 I got those.
Meh.
Maybe they'll loosen up over time, I'm using Polar bottles and the cages grip the bottles too tight.
When I rebuilt my Trek 720 I got "traditional" style King cages- those are swell.
M1000LT Drivetrain by
Dave The Golden Boy, on Flickr
M1000LT by
Dave The Golden Boy, on Flickr