I've used them most with Exacq. We experienced no issues with them integrated to Exacq in any of our tests. Camera side motion detection worked well on all the models we tested. We saw no streaming issues with Milestone, though I do not think camera side motion worked, so you'd have to use Milestone's built-in server side motion detection.
It doesn't really surprise me that Milestone or NUUO don't list them as supported if the integration is via ONVIF. If they listed out every ONVIF camera, it would be a very long list!