Highlander - good point. In your opinion, which user interface do you prefer - ZL or SWM?
I think the SC600's UI is a bit complex and takes some practice before you get it down, and so its not a great light to hand to a non-flashaholic during a blackout, and expect that person to be able to easily figure it out. Granted, as long as the person is able to click the button it will come on.....on turbo, which is generally too bright to just see your way around the kitchen of living room, and the light will probably overheat after a while on turbo and the battery wont last long, etc. Now that I am used to that UI, I'm OK with it, but its not an "every person's light".
I have a SWM T20CS, and it has both a head switch and a real clicky, but its actually a bit easier to figure out and get used to. I just dont like the fact that I MUST use the rear switch to turn the light on, then "switch over" to the front switch for modes. I wish I could choose to completely bypass the rear swicth and use the front switch only, but thats not possible without some current drain. You can click the rear switch to turn it on, then click the front switch to turn the light off and on from standby mode, but then there is going to be some battery drain as long as the rear switch is activated.
To answer your question more clearly, I like both lights, but there is room for UI improvement with both lights.......