I have not used it, but it would be low TH solo mine and total lottery / luck. I have seen posts where people have connected them to a solar panels so there is no energy cost, however the odds are astronomical that you would ever solve a block and in all likelihood would not recoup the money to buy or build the miner. If you are doing it for fun or educational purposes, it’s worthwhile. If you want to mine and make money or get no KYC sats, then you will need an ASIC.