I'm attempting to use AEC in conjunction with K2. I've done the micro-integration and created parity with the K2 & AEC user groups.  So far, so good.  There's one critical function I still need to implement:
I need to hide or change the download button on K2 item pages, based on a user's subscription.  Ideally if the user does not have a paid subscription, there would be a different button in place that 1) either allows the user to purchase the K2 item a la carte, or 2) directs them to subscription plans that grant them download access.

Has anyone had good results using K2 and AEC together?  Particularly in using them for download management?  Can the functionality I'm looking for be achieved through the component settings, or will it require custom php in the K2 item template file?

I combed the AEC forum but of course their forum search invalidates words less than 3 letters, so K2 gets filtered out :-/  Gonna go post a query over there in a moment...

So far I am really liking K2 and would like to deploy it on more projects.  For now, I'm just hoping I can get AEC and K2 to play well with each other.  Any/all help is appreciated!!!

If you are working in an override, wrap the attachments block and try to test for Joomla User and AEC user status and the current category then either present the attachments or present the buttons you want.

Hadn't thought of that, I'll see what I can do - thanks!!!

I realize that K2 and AEC are set to sync usergroups through micro integration. So I what I need is the correct php query, I think I may have found it...

After reading this and this I'm forced to abandon K2 for my current project. Not sure how I missed this when I decided to first try the component...being able to set editing permissions without being able to set certain viewing permissions seems...contradictory? There are a lot of things I really like about K2, but I urge the devs to implement more granular permissions control over attachments.

I really am looking forward to using K2 in future projects. Keep up the great work!