My experience with these guys suggests that they are absolutely straight shooters.
I called Benefit (in Jan 2014) because my home inspection report said my A/C needs to be serviced, because the temperature differential is too low and it isn't cooling as effectively as it should. Even though it was warm at the time, the guys at Benefit told me that testing right now wouldn't be as effective as testing during the summer, so they recommended I wait until temperatures warm up.
I also told them I have a home warranty, and they recommended I try to address the problem with the warranty company during the summer.
In short, these guys passed on work to save me $$$ and to ensure the service was performed at a time when it would be best. I doubt many other companies would do that.