I've used this extension on our production system for over two years now. The integration between Moodle and Joomla is very good. Additionally, the integration with other key components like JomSocial, AcyMailing, JomSocial ProfileTypes, HikaShop, etc. is also very well done.
The Joomdle community has grown quite a bit over the last few years with a very active user / developer forum. Chris and Antonio are very responsive. Support is as good as (if not better) than many commercial offerings.
I highly recommend.