the MCC changed the rules on handle composition so I don't think they are used in top of the range bats now.They are letting them fizzle out in club cricket but you can't use them in 1st class.
Not sure why anyone would want one anyway,they are mostly 'tinny' and not convinced you get any extra power.Newbery had loads of returns when they first came out for breaking but they sorted that out.I played against a bloke who had a carbon GN fusion this season,the handle came off in his hand and he chucked the bat in the bin.My mate picked it out of the bin and sent it to GN for a normal cane handle!!!!!