Well I have received the A26 ok and got it set up with BI and it seems to work pretty well (using RTSP). Initial configuration needs to be done with the LeChange app on your phone, and the available settings are pretty basic, but you can set some presets (favourites in the app) and turn on the Smart Tracking. BI will then just pick up the feed and the preset positions (the names don't get synced so you need to manually edit those), and PT control works from BI too. Smart tracking is a bit jerky but still pretty useful, and after about a second of the camera not detecting anything (or losing the object) it will return to the position it was in before it began Smart Tracking.
Edit: It has been pointed out to me in the Dahua section of the forum that there are a whole load of options you can change (which the LeChange app doesn't give you) if you use
SmartPSS, including text overlays, streaming options and SmartIR mode.