Im very happy with it, of corse Pis just top up my main mining machine, but I can leave them on 24/7 for a few watts which is cool.
Having been around the project for a while, I have faith the the Gridcoin project value will increase so the ups/downs in short term price dont bother me at all.
I have made more money than I ever imagined by just hodling my stake and selling little bits on the highs; I dont really understand miners who want weekly fiat earnings, thats not how crypto works in my experience. I then rebuy on lows, many in the community do.

The cool thing with Gridcoin, whatever happens Im doing genuine scientific research that benefits humanity; now thats real value. Thats why people tend to come to Gridcoin and not leave again, and thats why it will be a success; people value their contributions, as well as the financial returns.