I checked out their website. Nothing earth shattering. Looks like common, basic rebuild stuff. Their big horsepower claim is more or less just a starting point for most of the good builders who are regulars on this forum. They may be excellent, but based on their posted information I see nothing that would persuade me to give them my business that I couldn't get at even a good local shop.
Interesting to note their reference to proper "kickdown" and "vacuum" connections for the 200-4R. Most likely copied from one of their categories and is a red flag to my eye. FWIW