I can not say that I ever owned a Galaxy S2. When the first Galaxy S and the Galaxy S2 came out i just wasn't really feeling the devices. At that time I was heavily a part of team Moto! Touchwiz just seemed very laggy and i wasn't impressed.
I am impressed however that developers were able to get Android 6.0.1 on a devices that are more than likely laying in a landfill somewhere at this point. If you have a Galaxy S2 it is probably in a drawer. Just for the simple fact that you can you may want to extract that S2 from that drawer and install CM13! Grab the rom from the link below.
via XDA