I have the current 1 level E2L with the KX2 head. While I don't like that much anymore click switched levels, the new 2 levels ExL probably have their place as general purpose lights... I still think they should keep the 1 level option, maybe at a lower price?
All would have their place in parallel with the new E1B. I just hope my current KX2 won't ever break.
The thing I love the most with my current E2L is that it's bright enough and it will last forever on 1 set of batteries (9h is very long in my mind). I used my E2L in 2 camping trips, with a lot of use and I also played A LOT with it when I got it, all on the set of batteries that came with it.
[EDIT]Oh, also... The E1B doesn't deserve it's "Backup" name anymore with this E1L... 45 lumens on high is more than enough for most uses and 3 lumens low is much more backup than 5 lumens![/EDIT]