given the forced change from Together to Keep It, and the introduction of a more cost-intensive (a.k.a. subscription-based) system in case of use across devices Keep It is a mixed bag. with a promising trajectory, but also with some caveeats as to feature loss vis-a-vis Together.
while some big advantages can be seen (tag drill down for even better/faster file-/info-retrieval; and an overall better iCloud sync), there are some big losses on some features that really made me chose Together. others have some other complaints as to this (like encryption missing now), but for me the biggest loss – and one that seems a little self-defeating for an app enhancing the use of tags for retrieval – is the dropping of a well-featured way to manage your tags in the first place (Together had hierarchical tags, tag groups, you could see and review all your tags in a structured way).
so for me Keep It (along with its subscription politics) remains a hopeful contender. while it excels in some repsects over Together, and one can see a rationale for it becoming a 'different' app compared to Together, the loss of some of the real strengths of Together at a time where you have to put up more money will only be justified in the long run, if Keep It keeps it up on feature development – ... and also closes some 'gaps' in relation to the Together it´s supposed to replace (in some way).
– for people who now have to hang with Keep It but are accustomed to Together and its feature portfolio, there is a good thread to trace all the trade-offs involved (or most of them): https://www.macupdate.com/app/mac/15586/together/reviews