Once you joined PTR is there a way to go back.
Going back from PTR 2.4 release back 2.3 release.
It will be my most agonising for me waiting in those long queues.
There is a saying once bitten twice shy. Hope this will not be the case.
There is a drop down menu on your blizzard launcher where you can either chose the 'live' D3 release or the D3 PTR. The PTR is downloaded separate to the 'live' version it doesn't replace it.