I have the E1L, E2L and the E1B.
I use the E2 for general purpose uses such as around the house at night, working on the car and so forth.
The E1 will run for 4 hours or so on high before it starts to dim out. On low it runs for a very long time.
E1B is also a good light and it's the one I take if I'm putting it in nice clothes because the knurling on the others tends to be a bit abrasive on things besides jeans or other similar materials.
I think the E1L is a very underrated light that few talk about however those who have one (or 4 like me) know it's an excellent light that will meet about 95% of your common needs. It's what I take as a backup to my Minimus when night hiking. It's very good for walking the dog and going to the beech at night.
It's the sleeper in the line, IMO. Now if they'd just make one in HA black or offer a K series head in HA black I'd **** my pants then die from excitement.