The only close competitor to the SPECIFICATIONS of the new RCBS Matchmaster is an A&D FX120i scale and the Autotrickler/Autothrower combination from Adam MacDonald.
The RCBS at $900 would be $75 to $125 cheaper depending on how/when you purchase the A&D. From the specifications given by Midway, the Matchmaster in Match mode would be close enough to times I experience using the Autotrickler which is always in Match mode. If you are a buyer for the Matchmaster, I don't know why you would ever use "Normal" mode. Finally, I don't know if the Matchmaster's stated 0.04gr accuracy is actually the same as the +/-0.02gr for the Autothrower.
The only other difference I can see is that the Matchmaster is one single item (a benefit, and it looks pretty, sleek and familiar) with unknown internal components. How RCBS will handle required repairs after warranty is unknown. AFAIK
RCBS did not repair old Chargemasters that broke, requiring repurchase. The Autothrow system uses several separate components, including a name brand "pharmaceutical grade" scale. These can be individually repaired or replaced if necessary.
Should be interesting. If (1) the RCBS works as specified (Might take some time but I have no reason to believe that it won't), (2) the precision is the same as the Autothrow (I'd guess that it is), and (3) RCBS provides long-term after-sale support and repair . . . it will be a formidable competitor.
Two other points:
The existence of this device is a pretty strong indication that the Chargemaster devices are not "dead on, all day long" as many users seem to report lol. Personally, I've thrown and reweighed ~1,000 loads from my Chargemaster, and only ~80% were within +/-0.06gr. In 50 throws there were always a couple more than +/-0.1gr from target.
Either of these devices is a much better choice than swallowing the price of a Prometheous lol.