I have to throw in my thought.
I like the idea of bleeders with check valves but I also like not going through master cylinders every couple of years. Sending the master cylinder piston seals down past the duty area numerous times as an aid for bleeding the brake system will shorten the life of those seals,the older the cylinder the faster you will blow through the seals. I purchased a motive power bleeder several yrs. ago and could not be more happy with the how it works, this tool has paid for itself many times over. I personally would not bleed brakes W/O a pressure bleeder of some kind.