Currently i'd say that Expose is feature-wise at above 90% complete. There is little to no documentation currently aside from a little demo package i did to test + maintain it. One reason i didn't yet write documentation or shouted out to other people that they should use expose is my feeling, that we took a wrong direction. The introduction of TYPO3.Form and TYPO3.TypoScript added a flexibilty to the whole thing that you can't really find in other "admins". But it adds a huge amount of complexity. After using it extensively for 2 Customer projects this complexity feels plain wrong. It seems the direction expose went, got it to probably 70-80% on a DRY scale, yet we dropped well below 30% on a KISS scale. The performance was an issue as well, which is improved through the TypoScript caching, yet that's one more thing that you need to configure and take care of :/.
Because of this i've h