In preparation for a Legion-based Mutants and Masterminds campaign, I lent the two existing Legion TBs to a good friend of mine (Great Darkness and Beginning of Tomorrow). Here's what he said about BoT:
I started The Beginning of Tomorrow storyline with the Legion yesterday and I loved it. I poured through the first two hundred pages and got really pulled in. Apparently both the little red-haired girl and Steve tried talking to me and I didn't hear them at all because I was so engrossed in it. I should have started with this one first! I like the establishment of the relationships and some of the interesting twists they've put on everything.
He had already read the Great Darkness trade when he read the BoT. He's never read the Legion before now.
I feel like a preacher. My friend has seen the light!
Now if DC would just publish some more trades...