An R8 can be a very attractive trombone. It will look pretty and feel great to play. It will not make you a better player though. I am using a double (R9) and single (R8) setup. The R8 is a lot lighter and you will get a massive list of options so you can build a unique instrument. More than anything you get the joy of owning a hand crafted beautiful instrument.... downside... you have to pay for it
If you want to go for it I can talk about options via PM if you want.