EGO 7 and EGO 8 differences are the EGO 8 is a bit lighter and has a black on white display which is easier to see in sunlight, (and the EGO 7 has a white on blue LCD)
The ETEK 2 only has LED Lights (unless it has ben star framed)
lets out the discharge gasses out quicker i think.
and as for the 3 egos....out of the 3 i prefer the 07 anyday.
the etek 2's stock trigger is HORRIBLE HORRIBLE imo and the LED lights make it a little hard to set up the gat.
the 07/08 are prety simmilar apart from the difference already stated.
and once again i dont like the trigger on the 08 but i do on the 07.
soit comes down to presonal preference.