I've used to run my it in my miata, until I've moved to Haltech. Given what it's worth speeduino is a killer in terms of price to performance. IIRC I've moved because speeduino being based on ATMega, doesn't allow for high resolution tables, and overall it's quite basic. My friend used to run megasquirt and while it had more features according to him megasquirt was harder to setup right than speeduino
Yup, starting with 1.18 the started blending old chunks with the new ones. Earlier there was a hard transition, personally I prefered the hard cut, there was something to it, something mysterious about it, but I get why they wated it removed