Having had an RA burris and sold to get a 4200, i'd agree entirely with the above apart from saying the burris is no brighter but comparable.
The only draw back on the burris is no option of mildot on the RA and they are no where near as robust or light as the titanium built 4200. Mine had to go back for rethreading of the px ring and all of the ra's at the club had been sent back for similar or turret work. All FOC of course under the no-quibble lifetime warranty.