Yeah, its more expensive, but I would rather not mess with hacks just to enhance a camera. I would NEVER bring a hacked camera to a shoot (that's probably just me, however)
I have used the GH2, hacked, on numerous PAID shoots...in fact, just got the check in today for one. There's no way I'd bring the GH2 to a professional shoot unhacked.
But then I did my homework. The only possible problem is if you cheap out on SD cards (I didn't). Sedna is pretty reliable in my experience, and I've heard great things about Flowmotion as well. Most of the unreliable shooting situations involve 60i/720p60 and using ETC mode with Lumix lenses. I primarily used manual Nikkors, mostly shoot 1080p24, and rarely utilize ETC mode (but I have for run 'n gun for a large tech corporation and it worked fine).