SplashMOD is very smooth, having no issues with it yet, been in use for 2 months. No FCs, all apps working fine.
CM7 was with me for 4-5 months. Towards the end it got very laggy, like seriously jumpy (probably due to neglect), but battery life on splashmod is no where near as good as CM7.
Maybe i just use it more. I think sleep as android and copilot rinse it, which i didnt have on CM7
Am switching to Rempuzzle soon so see what all the crack is about