Along with some other Stihl stuff, I have a MS 192T and my wife has a MS 192 C-E. Hers has the easy2start system and the difference in starting ease is stunning.
I don't know - on little saws like that (or on some other Stihl equipment like blowers), even a child can start the saw, and it seems like dragging the extra weight of the easy start system around all the time isn't worth it. On the larger engines, they do make a noticeable difference in ease of starting, and don't add as much weight percentagewise.