I have the Dive Rite version of the suit, the 905. The 905 and the Extreme are made by the same company, Polar Safety, I believe in Finland.
As far as the basic suit goes, I don't have too many complaints. I am very happy with the suit. The biggest is that the legs are cut a bit big, so I wear gaitors. One thing I am finding now is that the valves are leaking a little bit.
If you like the Extreme I would suggest looking at the Dive Rite. If I remember correctly the Extreme lists for $1400 and the Dive Rite is $1200. I think that the 905 has some nicer features (comes with attached thigh pockets, a solid zipper cover, warm neck collar, larger protected areas) than the Dacor.
JoelW