I just got a couple convoy s2* sst-40 flashlights and ordered one driver from China that had some quality control issues. The bypass wire was cut in the middle and it had very moderate amount of solder. Then I order one from mountain electronics and it was incredibly well built. I got it with the a6 firmware and 7135 for the low and a MOSFET for the turbo. I also bought a beefed up switch with a bypass for the extra current. I hope I'm not breaking any rules mentioning brand names and I read the rules and think I'm OK. But yeah, I thought it would be helpful for anyone hereooming for a place to get high quality components for their lights and this place can't be beat. They're in the US so shipping is fast, their costumer service has been great so I thought it might be of interest to people here. Also it might save you from wasting money on bad parts like my experience with the driver from China. Hope this helps anyone and hope I didn't break any forum rules. Have a great week and happy shinning.