IMO, the Ready Brute Integrated Towbar and Braking System is without doubt the best bang for the buck there is.
If you already have a towbar that you are happy with, then the Ready Brake System is best for you.
Note that there is a breakaway system also available. If you are going to go for the braking system, you might as well have the breakaway to go with it!
At the present time, I do not have one, but if I ever decide that the braking system is something I should have, the Ready Brute/Ready Brake system is the ONLY one I would even consider.