I purchased this plugin to use it with joomla 1.5 and k2.
It does the essential stuff well, my links now have rating in the serps.
However, if someone uses the default rating of k2 to sumbit his/her rating then, even though k2 database is updated, the plugin does not reflect the change (tried everything). Also if you need to reset the K2 ratings at some point (which is the case most of the times), doing so will result in having 2 ratings, the K2 rating at 0, and the microformats votes rating at whatever it was...it'll stay like that forever. Only workaround is to deletethe database entry for the specific item in te plugin's table. Not good!!!
Also, the developer didn't wanna hear any of it and closed the forum topic abruptly saying it's not his plugin's fault and that I should give him admin access to check it for himself........admin access to a live commercial site..... fishy at best.