I'm using it and it's stable and great. I looked at it quite some time ago and thought it was cumbersome to configure, but the new 2.0 version is much easier. It did take a little learning curve to figure things out, but once I understood how they did things, it was quick and easy to change to my needs. I mostly use it as a web based and mobile phone based interface to my OPII. I've recently just added some triggering from my Blue Iris camera system and that was also easy to configure and use. I also have the Denon module loaded in it for control of my amp. I've not had time to link in anything else.
I was previously using the H@ME app on iphone/ipad and this easily replaced that app and added so much more. The files for configuring the web and mobile interface are text files, but it wasn't difficult and it gives a lot of flexibility.
I'm not a Java coder, so I haven't done any mods to the source code (and don't plan to) as it offers everything I need in the regular package. One cool thing about it being Java based is that the whole installation runs in a JVM which means you can just move the whole directory structure to a Windows machine, Linux or Linux/Rpi setup. There aren't any cumbersome installations - just unzip the file structure and run it as is. I really like that.
There's several of us here using it now, so shoot any questions and I'll try to answer or someone else may. I can do some screenshots of my mobile and web interface if that's what you're looking for.