My experience with FullContact was one of constant duplication of data (at both record and field level for both exact and inexact matches. I.E. two contacts rep

My experience with FullContact was one of constant duplication of data (at both record and field level for both exact and inexact matches. I.E. two contacts representing the same person with say, differences in first name -- Jon vs. Jonathon for example -- would often result in two contacts with a combination of fields from each of the originals. Didn't have to be name. Address, for example. "Road" vs. "Rd" confused the hell out of FullContact routinely...), totally useless features to resolve (in particular) non-exact duplicate matching, and an absolute contempt for any manual curation at all. Essentially it made mash of my contacts, wouldn't let me correct them either in their UI (with features built exactly for that), and or in any native apps, more than a year on I'm still nowhere near cleaning up the mess. All they had to say about it was that "synchronizing contacts is a hard problem", or something to that effect. No effort to repair/undo the damage, no suggestions on how to avoid future problems -- sorry we ate your data, sucks to be you.