Kai has recently expressed some things regarding the future of OpenHAB organization (versions, and other)… The Future of openHAB
I used to be running 1.5 and am now running 1.7.1… there are a lot of under the hood things that have been fixed and improved… but there are also changes so depending on how complex your setup is and upgrade may lead to having a bit of work to do to get things working properly.
If you are happy with your existing setup and are not currently building it out, I wouldn’t change it.