1) I didn't like that its approach seemed overly complicated (e.g. its database format, client apps, etc)

2) I was having a really hard time synchronizing passwords, especially if there was a sync conflict. When they happened, the entire database was a 'conflict'. There were also issues I had with the actual sync mechanism, which at the time I had the database on a seafile instance and had to enable various 'hacks' in keepass to get it to play nicely (e.g. file locking, etc).