I was advised for my La Lorraine (salm type). That you can finish on oil. I've not used the stone enough to have learnt it yet but I got a decent shave edge on oil with it without any heavy pastes.

I need to play more with it but It certainly seems capable and there was a huge thread over on Coticule.be that got published about a blind test of coticule v/s BBW. The results are actually pretty interesting.

http://www.coticule.be/the-cafeteria/topic/1452.html