I don't have the Zeus, but I do have the Vector. I have zero complaints about mine. I've put 300 plus rounds through it, taken the barrel off a bunch of times at the range, spun it back on and it held zero.
That said, Joel left Curtis for a reason and the Zeus has been updated/upgraded from the Vector. If you have any questions, give Joel a call. Awesome guy, great customer service, and very passionate about his product.
Your TL3 barrel will NOT work on this action (different tenon). You can however get shoulder pre-fits for the Zeus to be torqued on with a wrench or hand tight with the set screw feature.