I was pretty nervous to flip into idle up the first time too. I finally got up the courage ... flipped the switch ... Wow! Not that much different! Then I realized that idle up was inhibited on my radio so nothing was happening when I flipped the switch anyway! Ha ha. Well, long story short I do FFF and idle up is better because there's more neg pitch available to maintain the altitude I want.

I find that the switch on my Futaba 9CHP is sticky and sometimes doesn't get me into or out of idle up mode sometimes. I have to flip back and forth a couple times to make sure it switches. Anyone else find this?