put my vote for the RK2.
i also have not finished setting it up. I will not have the ability to try a ACJr personnaly, very few actually used both! My final decision was based on looks, and the RK2 has a cool off restart for MH lights after a power outage. The current models are pretty much the same between RK2 and ACJr. RK2 comes as a complete package, the ACJr needs to be ordered seperately. The AC3 does have more features, but more money than i was allowed to spend! It also has the direct ethernet connection.