I purchased a QTA about a month ago and it has preflash. That's the only complaint I'd have with it. It's really not bad enough that it disrupts my NV though, if that helps you.
Well I've purchased well over a dozen Quarks, mostly within the past year during the great re-branding sales, for myself, as gifts, and for friends looking for lights, and most were XML versions (2 NW). Here's my experience:
All have a minuscule millisecond "pop" to them on moonlight - I'd say 0.6 lms - my D25s do the same. I don't know about others definition, I don't consider that to be pre-flash, and it doesn't bother me at all.
Of three XPGs (R5s and an S2) one R5 AA2 Turbo has a serious pre-flash, literally 100% output, on ML, L, M if the light has been off for 5 mins, or coming from a high mode. Now that's really annoying, and I have to remember to cover this one on first activation or I'll be seeing spots.
Thanks for this info. I almost bought an S2 from Going Gear's clearout sale, but now I'm glad I didn't. Do you own any 123 tactical with the new branding?