Just to second what others have said, use the money you save by going DI on other goodies or upgrades. I think the only time it would be worth it to go piston would be with a suppressor. That being said, I shoot my DI guns with my suppressor and I don't really notice much gas in my face. A gas gun will still need to be cleaned, it's just a different area that needs to be cleaned and it will still get hot, just a different area gets hot. I'm not planning on doing multiple full auto mag dumps, but even if I did, I think a well maintained DI gun will handle it. My dad's M16 did in Vietnam on multiple occasions.