I spent several weeks trying to decide if i wanted to invest in a brake controller for our new-to-us travel trailer. Since i grew up on a farm, trailers are nothing new to me but brake controllers are. I am pulling a 26' bumper-to-bumper trailer with a 2006 Yukon Denali XL and the 400 miles that I have pulled it have been without issue. However, there was one time that I wished that I had more stopping power and the trailer seemed like a load for the Yukon's brakes,so I started researching brake controllers. First I looked at a middle of the road option from Wal-Mart, but then I ran across this one for $40 more. Somewhere in the reviews a person mentions the cost of not having one, and he/she could not be more right. $20,000.00 SUV, $4,000.00 trailer (weekend warriors), and my priceless family and family pets....and I had to think for two weeks about spending $100.00???I ordered the brake controller and the proper wiring harness from Amazon and had it in two days thanks to my prime membership. With the $10 wiring harness for the Yukon, I was able to install the controller in 20 minutes...no joke. No splicing...no fuse manipulation..no electrical tape...just plug-n-play. Also to my surprise the Yukon had two pre-drilled holes in metal directly under the steering column that fit the brake controller mounting bracket perfectly. Now for a test run.I hooked the trailer up and the controller immediately detected it so I took off slowly down my driveway. While I did look at the brakes when I purchased the trailer (I am pretty sure the previous owner never used them), I had no way of testing the overall system so my first test was to see if the trailer brake system actually worked. It did. In fact, the boost was set on 2 and the wheels locked up with little effort. I tried no boost and then settled on boost 1. I can see where the options of no boost, boost 1, and boost 2 will be nice when going through the mountains.Anyhow, the final test, I took off down the road and not 3 miles from house some yahoo decided to pass me on a two lane road at the crest of a hill and forced me into a situation where I had to put the brakes to the floor. In that instant the trailer brakes locked and stopped the Yukon, not the other way around, and every ounce of buyers remorse was gone just as quickly.Give yourself some piece of mind while saving the brakes on your towing rig. Buy it and grab a wiring harness while you are at it.