El Capitan Beta 2 is unfortunately not working for me. USB devices work OK in OS X, and they show up in Parallels' Devices menu, but selecting a device to assign it to the VM does not work. Parallels does not show a check mark next to the device in the Devices menu, and the VM never sees it.
I tried both with and without the "nvram boot-args" fix, but it doesn't seem to make any difference for this particular problem.
I'm working with an existing Windows 7 VM that I ran just fine under Parallels 10 in Yosemite.
EDIT: Nevermind! I was actually on beta 1 - evidently you can't go directly to beta 2 without passing through beta 1. After installing the beta 2 update, things work correctly.
Last edited: Jun 23, 2015