Interesting thoughts. I like mine. I'll go out on the limb and say it's not even over priced for what you get. I bought mine used, but since using it I'd buy new if I need another. With as much money as we spend in the search for precision, this is a minor investment when I consider all the other stuff I've bought.
The die is repeatable, accurate and easy to adjust when toying with seating depth. Much easier than shims or playing around with a set screw. In my experience with this seater, the clicks are truly .0005" increments. When I check loaded round they are amazingly close. Two clicks = .001, ten clicks is .005. I've tested this pretty extensively with my custom bullets and feel confident with the results.
For me, it's a simple matter of recording my touch and jam numbers and correlating that to the number on the seater dial and recording that as well. I have those numbers recorded for several different bullets and can change on the fly with a quick turn of the knob and I'm back in business.
IMO, the only thing that would make this die better is if I had the ability to buy one as a blank and have the smith run my reamer in. I had my smith just do this for me on standard Wilson seater blank. That die works great, but it takes more fussing to make seating depth changes using shims. Just bought a micrometer top for it to hopefully make it more user friendly. Hope it's as good as the Sinclair/Wilson setup. YMMV