what are your needs which cannot be met?
We evaluated it a year ago so apologies if things have moved on since then. I recorded its weaknesses for the Wikipedia project we were planning as:
1) No links between articles 2) Requires it's own browser, not a standard desktop browser 3) Doesn't run under Apache
Looking ahead we also noted that our Offline Wikipedia offered advantages because
A) Our solution could run on Linux or Windows - Linux provides a key part of our infrastructure but our clients might not want to support it
B) Our solution could be extended to support other Wikimedia sites, e.g. Wiktionary - database dumps are readily available Wiktionary but I don't see that same availability for OpenZIM files
Regards,
Kevin