As far as the fluid seams, mine only has it in the torso and not arms/legs, so again, maybe that is a design change.
My i-Soldier has it throughout the entire suit on all the seams. I think if it were only in the torso it would make a huge difference in the flex of the suit. My 222 has no seam tape and it's the best suit I've ever owned. I think this is a actually a design change because I remember seeing seam tape on the 434 in the store in 2012. Glad they made the change. I might need to check one of these out now.