That's one of the reasons I wanted to ask here before making a choice, I didn't know that and would prefer one with a driver so the brightness stays constant. However, I'm used to the dimming light serving as a reminder that I need to recharge the batteries soon. Do those with a driver just die suddenly with no warning? The constant brightness would be an advantage but having it die without warning could be a problem.
Yes, as mentioned, the Zebralights, and all decent lights, will step-down before the battery dies and give you plenty of warning that you need to change the battery. The Zebralight on an Eneloop will give you several hours of run time (on a low level) after it can no longer run on high. So, you definitely will not get left in the dark.
I don't use alkaline batteries in anything but smoke alarms,
Then you definitely will benefit from a modern good light. If you run alkalines, Maglites may make sense. Otherwise, buy a quality light that will perform much better on Eneloops or other good NiMH cells.
I will definitely be looking at some 1 AA flashlights but to be honest I like the Maglite XL200, it seems to have a rotation sensor that allows you to rotate the flashlight itself to adjust brightness, strobe rate, and also has a mode where it dims itself when not moving and goes bright again when moved. Do any 1 AA flashlights have similar features?
No, you won't find that interface on other lights. And, you'll probably find that kind of interface extremely annoying. Do you really want a flashlight that changes modes on you without you doing something? If you put down a light to shine on something while you use two hands, do you want it suddenly dimming?
I prefer a light that has a few brightness modes to chose from. If I want a medium brightness, I select that brightness and I know it will stay there.
Sound advice from a recent purchaser of the SC5! As I recall, AVService has not yet decided whether he likes the SC52 a bit more than the SC5. Last I read, he was still waiting for an Eneloop Pro so he could check out the Hi mode on his SC5.
Yes, AVService is the guy that refuses to use anything other than alkalines, even when he has to use several of them per day. He knows about recharging, but thinks it's too much bother or something like that. He should really stick to lights designed for alkalines, such as Maglite. The SC5 is a real waste to be run on alkalines.