Hi gamezaway. That driver looks very similar to the TR-3T6 driver and will likely perform just as well. There are voltage sense resistors under the inductor coil. Current to the emitter can be adjusted by increasing or decreasing resistance. Moderator007 has ordered one and will report back when he gets a chance to use it. The TR-3T6 driver may not be available now due to problems at Manafont. That driver can be used to drive an xml at currents that will instantly blow it. Here, I used it to drive an xml2 at 7 amps, but the emitter did not last long.
You can use this driver to run an xpg2, but you probably want to increase resistance of the voltage sensor bank to bring down the current some. I haven't played with the xpg2's, but I understand that 5 amps is dangerous territory for it. RaceR86 has driven the xpg2 at over 5 amps in a light, but others have had their emitters fry in that territory.