just started this game called tera and I am semi hooked which hasn't happen with a game in a while. If i try this beta and loose bootcamp it may save my life much turmoil and embarrassment, if it don't try it I can restart in windows and play my game sooner today....hmm
Here is my experience. If u just upgrade the yosemite to el cap PB1, it should be fine. But if you create another partition and then install on newly created partition, you might loose option to boot into windows (bootcamp partition).
Even if you try via refit (or something else) still says : no bootable device found after blinking white cursor.
my windows 7 partition works with no problems. only strange thing was on the windows side the keyboard stopped working but not sure if that was connected to the mac side or just a corruption. a bit of random clicking in the bluetooth settings and it installed a new driver and all was fine.