I have owned both and both are great lights(I had no problem with my U2's quality). The U2 is very useful with multiple outputs, clickie switch and pretty tough, and ohh so different from the AE. The AE is huge (15 5/8" inches long), there no other way to say it, compared to normal handheld lights. But it is awesome, turning on a hid is exciting as it warms up (full power in ~8-10 seconds), but try using it to find your keys in your bag and you'd be seeing stars
. If you want a useable EDC or day to day useful light get the U2, if you want something to impress your friends get the AE.
On small LED lights(similar to U2) also consider a McGizmo HD45, slightly larger than a U2 but tough, good throw, to my eye more output than a U2 on high and a very useful low level (available here...
http://theledguy.chainreactionweb.com/index.php ...but not now
there is a 3 and 5 watt version)
Ian B