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. This is the first altcoin that has ever significantly interested me.

I will definitely be buying grin fairly early on. Probably won't bother figuring out mining, though. Note that due to the way grin emits its coins, prices are likely to start out high and steadily drop for the first few weeks/months.

If you're mining grin and want to sell for BTC: let me know and I'll buy from you.