the software looks useful, and while i haven't tested it, it looks like it'd work fine. it's $99 for 5 connections, unclear if a "connection" is a workstation, or each printer on a workstation, so might get expensive.
things i don't like about it, is, i had to register and verify an email address just to see the documentation (500kb pdf). thankfully there exists mailinator.com
some of their software (terminal server pro and others) intentionally violate MS licensing rules, for example making sbs and xp able to host multiple simultaneous inbound remote desktop connections. they don't tell you that they're replacing several DLL files with cracked versions, and violating your EULA, voiding your MS support.
but the universal printer they offer probably would work ok.
it might be easier to just get the server guys to install the right driver. if your client has the 1200 PCL5 driver, and the server has 1200PCL6 or PS, then the server doesn't have the driver installed.