Sorry if I'm wrong. If your clients are satisfied, then there is no problem. Bat I will stay on the free firmware. Good luck .
I'd welcome feedback on your experiences with that particular firmware. I've had multiple farms switch over to my stuff who ended up running into issues with stability with that one. The instability manifested in a number of ways, some of which might have been environmental. Simultaneously, I know of a few users who do not have any problems with it.
What I can state for certain is my goal is for the firmware to operate exactly as described, and nothing else. I expect users to be happy with their results and encourage feedback and partnership to resolve any inconsistency between their expectation and their experience.
*shrug* -- my firmware provides more than overclock, it also provides good customer service.

-j