Tried the demo and I have to say, even as a fan of Total Annihilation and Supreme Commander, I was dissapointed. For $20? Not a chance, even to support an independent developer. Perhaps the demo is a way older version or something, as I can't imagine where they got the screenshots on Impulse. This isn't even as advanced as the last Spring release (a freeware TA 3D conversion) I tried. It does seem to use the Sping engine though, as "SPRING" is prominently displayed on start up.