I've been extremely interested in Mimblewimble since it was first presented a couple of years ago, though I only recently heard that grin is finally launching its mainnet soon.
Me too, I have been waiting for this for a very long time.
I have talked about it with a few very crypto code-smart people quite a while ago and they also seem to have high hopes for it.
I'm so glad to see that a mimblewimble implementation will finally be up and running in the new year! I'm hoping to mine early on but it may not be possible due to the RAM requirements.