I have only one light from them, and it is the 3 N cell one. I have to agree that I haven't been too impressed with it. The little rubber switch cover only stayed in place two days, and some other sites have reported similar problems. There is a little resistor in the tailcap, but it still is seriously overdriven.
The one cool thing about these lights is that the LED leads are cut short and pressed into a little socket. If you want to switch LEDs, all you have to do it pull out the old one, and push in any new one you want after you trim the leads. I added another resistor to get the current down to specs, and then put in this cool color changing LED from lsdiodes.com. Now its like a little party on my pocket.
All in all, this was a pretty lame light, especially for the price.