I don't like expo...my brain knows that if I move the stick X amount I get a response...if I want twice the response I move the stick 2X....with expo that doesn't happen....I prefer LINEAR !!!

If you have the normal "soft in the middle" expo, you move the stick a bit to control a movement the heli has made and it's not enough, you automatically move it more. But now the bit more gives more reaction than the first bit did, so you over control even more.

Once you can fly, then use expo to polish your flying, but it's absolutely no good for learning.