The PiStorm is pretty much nearly there. The issues have been mostly around Whdload games and certain graphics packages like Adpro. It’s get updated a fairly regular basis. Each update brings more fixes and updates. The PiStorm cards retail for around £80 plus the price of a Pi3 or Pi4. You are looking under £200 for a 68040 card which can clock to 2ghz and 2GB of FastRAM. Not bad considering the alternatives.