I have used my friends
I have used my friends Gen 2 jig in the past and it worked just fine. I think the Gen 3 is easier and quicker to set up. I'm sure it's just the newness of the end mill but it seemed to cut quicker and quieter.
My only small complaint is the use of Phillips head screws to mount the top plate. It would be great if it came with hex or even better Torx head screws. I did find some replacement hex head screws.
Buy one, you'll like it!