I've read it in chunks. I had Essential Fantastic Four 2 in high school. Always wanted to read the stories in color, so I was holding off to read the whole run until I could make that happen for cheap. Does MDCU have the issues? That'd be another reason to make the investment.
Well I know the FF Omnibus vol 1 and 2 are being re-released in September and December. If you pre-order them from Half Off Trades/DCBS you can both for a little over 100 which is a steal.
I pre-ordered my upcoming kid vol 2(that's the really good stuff).