Yes I do and from a user perspective its much better as it tends to be lighter in term of network request and smoother as you don't need to load new tiles for every single level of zoom.

I just hope leaflet will be there one day with smooth degradation for browser that don't have webgl enabled

I've been following it. The last time I tried it was a bit slow for my use case at the moment but maybe it has come along since then. I'm wondering if the C++ port that MapBox are building turned into WebAssembly might end up being the winner there.

Yeah I'd love to know about people using it as well. Certainly the features would be really useful.