I didn't even know about Sigma Six until I saw them at a ROSS "Dress for Less" Store last year. My first brush with them was the 2 inch scale DragonHawk. At $12.99 it was worth a risk.
Then came the vehicles piece meal. I got hooked like crazy on them. And one day, I saw them. Those 8 inch monstrocities lining the shelf. Man, I bought one just to see how it was. $10.99 for the Duke with the long cannon attachments. (I still haven't remembered all their names).
I went back a few days later, then again, and again and again, and within a few months, I had about 15 figures. I Love army building, so I swap gear so everyone looks similar, or at least like part of a small Combat Team. And after a Ninja Tracker ATV, and a couple of Snake Eye Paratroopers later, everything disappeared
At least they got the Cobra and Joe 5 packs for $11.99 so that softened the blow a little bit. I can't believe I bought 18 Cobra Legions and 8 G.I. Joe sets altogether. That's what got me into the 25th Joes.
I LOVE the Sgt Savage figures. I bought a ton of them a when they came out, and then again when they were sold at a fraction of the price. The 1990 RAH HQ and the Savage P-40 made a GREAT WWII scenerio.
As for G.I. Joe Extreme, I was VERY disappointed with the toys. I don't know... I bought the figures, but you couldn't do ANYTHING with them.
G.I. Joe has changed many times over the years, but has always (and thankfully) returned to the Military theme in the end.
All-n-All, Pretty Cool ...