I installed the LM 20 Cinnamon Beta when it was released and then upgraded to the stable release from the beta version. After using the fully upgraded stable version of LM 20 Cinnamon I noticed a few odd things happening. For example, when I brought my laptop out of Suspend mode Cinnamon would oftentimes be unresponsive. I would have to then press and hold my power button to make the logon screen appear. I also noticed that the system was a bit sluggish at times so I decided to start from scratch and do a clean install of the stable release. After a couple of hours of reinstalling some apps and reconfiguration everything has been very smooth. So, for me the upgrade seemed to bring up some issues so I elected to go with the clean install as a solution. Best wishes for you with your decision!