Yes, I like them too. I was at their recent conference in Berlin. I would be very interested to take a deeper look at their technology sometimes.
The underlying theory of their computation model might turn out to be better than Ethereum’s. But I think if Ethereum manages to do sharding and Casper as they promise, RChain will have to be not just better, but much much better in order to take significant market share. As long as Ethereum 2.0 is good enough, most people will probably just stick with it. Just like devs now prefer to use Python instead of Haskell, even though Haskell is obviously the better language