Good point about the "silver" E2.
From my persective, I don't consider the -SG "Satin Gray" finish to be suitable for everyday use. It scratches far to easily.
Hard Anodised (-HA) is the only finish I use because of it's excellent durability. SureFire HA is to Mil. Spec. Level III. Details can be found in the data section of www.pk-engineering.com
It has been commented that HA is less obvious compared to "standard black" - especially when viewed using NVGs. In my experience, the almost gloss black finish scratches up easily too.
So the E2-SG silver is a show-off (or give to the wife for her purse etc) flashlight - a fun version of the very useful E2e-HA.
Under some lighting conditions, Natural HA can look very dark slate gray or deep, dark green. If you see photos of the WeaponLights in use out in the field etc, they appear different compared to the photo studio conditions.
SureFire make three "OD" green models - the G2-OD, the G2R-OD and the 8NX-OD.
These are a polymer called "Nitrolon" - a highly durable alternative to Aluminium.
Regards,
Al