I received Spiked Tail and Stalker as christmas gifts, and I like them both. Very unusual but awesome designs imo. I never had the vintage kenner versions even though they would have been in stores when I was a kid.
I love spiked tail's cannon and his headsculpt with the bendable braid. I also like how neca was able to combine some reused parts with new parts to make him stand out from other predators. I'm very impressed with how they managed to take a rather laughable looking figure that kenner made and turn it into a plausible predator design. Same goes for stalker. The glow in the dark body is awesome, it works surprisingly well. Both are fun figures.
My only complaint with them is that neca still needs to improve the leg joints on their predators. The hips, ankles, and knees become loose way too quickly. The knees on spiked tail are still tight, but stalker's are very wobbly. Makes him hard to stand.
I do like the new arm articulation. It functions a lot better on these bodies than it does on the avp body. Really looking forward to those new ultimate versions of the Jungle and City hunters.