For context, I use WMLs as an average guy in a concealed carry application.
Second what pretty much everyone has said about the value of a higher candela light in settings with mixed lighting, window tinting, etc. When carrying a WML, these days it's either an X300T or Modlite PL350 (I prefer the latter for its rechargable battery and better balance of spill/throw, though the former is slightly shorter and therefore a bit more comfortable worn AIWB).
Prior to the existence of the Modlite offering, I used X300Us, and before that, TLR-1 HLs. I used the X300U in a couple different low-light classes. It worked well enough on the square range, but that was in ideal conditions with minimal ambient light. Likewise, inside a pitch black shoothouse, it worked quite well. Inside a well-illuminated shoothouse, I experimented with using the X300U to "blind" a role player during force-on-force; the role player reported it had no effect on him. Inside a shoothouse illuminated moderately-well by ambient daytime light streaming in through the windows, I found the TLR-1 HL provided insufficient illumination to PID a target about ten yards away—the light just didn't have enough power to overcome the ambient light (granted, it was a 2D paper target and a role player holding a weapon might have been more easily identified).
At this point, my X300U lives on a dedicated nightstand gun because I do appreciate the diffuse lighting inside my house where my longest shot is 12 yards. Out and about, where I'm more likely to encounter mixed lighting conditions, it's a Modlite or Turbo on my gun. If I were carrying in a professional application, I'd absolutely be carrying Modlite or a Turbo.
The TLR-1 HL and X300 Ultra were great lights in their day when they were the best thing on the market, but time marches on.