I have the summit/jegs style seat in 3 of my cars. I did try a kirkley seat for 2-3 years about 10 years ago. It was okay, but the angle of the seat (Base to back) was not a comfortable as the ones I use now. I'm pretty picky when it comes to my seat and placement. I like to be sitting so everything feels natural and within arms reach, etc. Angle has to be right and the height of it. I've spent many hours making my seat fit how I want.