Love it! When I got into playing with arduinos I googled "cummins arduino" and found a ton of threads on message boards where they discussed this very idea. Glad to see somebody is putting it to use!
Will this put us into the same tuning category as a common rail that can control duration, timing, and even multiple events based on inputs? No. Will it help us create smoke free trucks without having to spend hours upon hours digging into the afc? Hell yes. I love it and would buy one in a heartbeat.