Their notches are awesome and easy to install. I don't care what anyone says, tubing notches are so much easier to put in than an 8 piece notch. I have seen the time it takes to put one in. Me and James put in my one piece in a little over 30 minutes and it is perfectly level and straight from every corner.
Just cut out the top of your frame, slide in the notch, get it straight, weld it up, cut out the center, and finish welding it up. It is so easy.