I know the Flintstone method is in jest...but after being without, then with a controller I am a huge advocate for brakes. It really does make a big difference in stopping ability, personally I would never tow anything without them any more.
I had one or two "pucker stops" when I thought my f150 brakes would be adequate for my 2500lb trailer...just not worth the cost of cleaning the leather.
I don't think the controllers make a lot of difference a sling as they are proportional. I have a Tekonsha p3 that works very well although I would probably try a lower cost controller if anything happened to it...again, as long as it was proportional.