I've owned two of these, the first I picked up in 2009. The original MSRP was $500, and they were released somewhere around 2001.
Other than the A2, I've put more hours on these lights than any other in my collection of Surefires.
There are two lamp assembly's to choose from for the low beam, the MN30 (60 lumens) or the MN32 (110 lumens).
Fresh hot off the charger, with the MN32 LA installed, the light was putting out something on the order of 700 torch lumens plus IIRC due to various comparisons I did with other lights. It's brighter than an M6, and the beam is more impressive due to the massive spill, along with slightly better throw.
At the same time, it's the most flaky, unreliable Surefire I've owned. And sadly, my second one broke last year in the same exact fashion as the previous one many years ago. The weak point in these lights is the small metal tab inside the bezel that makes contact with the battery pack. After years of use, it eventually breaks off from all the repeated flexing/contact. I suppose someone with the skills could solder it back on, I didn't posses the skills to fix mine. A small little oversight from PK possibly.
The chargers are batteries can be problematic as well. I had several issues with the chargers, and a few battery packs had cells that were out of balance.
However, all those issues aside, the versatility of the dual beams, and the sheer output, it's an impressive light, especially for the day. And a very underrated one as well. With the inability to fix mine, sadly it went back to Surefire for credit towards a new light.