I bought this light with the DI pill to start with and both reflector types (SM and OP), but quickly switched to a 3SD running with the OP reflector. While the variable output was nice to have, in a single mode light it was just too awkward to have to go through the programming cycle every time to change the brightness. I don't need it to have too much throw, as I have a Raidfire Spear to take care of that. The OP smoothes out the beam without too much cut on throw. For the minimal price difference at purchase time, I'd say get both reflectors to see for yourself.
The build quality seems quite good, however both my modules give more cree rings than some other brands in the price bracket, even with the focus adjusted by turning back the pill in the reflector.
I'd buy it again without hesitation due to upgradeability and build quality, although being a P60 host you can cut corners in price and quality and end up with the same light output (UltraFire + 3SD, for example). If it didn't utilise P60 it wouldn't really stand out as much other than for build quality; upgradeability and end user customisation would seem to be the main selling point of this light. If you are not after a P60 host, there are plenty of other similar size lights with a similar price, profile, and beam pattern, such as the TK10 and Jet-III IBS.
Regards,
Eric