Right, first of all, they are not worth $70. I once bought a sealed Humungosaur for £1. They’re practically worthless.
Also Spidermonkey’s missing his tail.
As for the sets themselves, definitely get at least one if you can. Most of the pieces are hollow and useless, but the torso is in my opinion the best constraction prefab torso. You can stick little spikes in the back and everything. There’s an abundance of connection points, and it’s not that hard to add regular pieces on them. They’re even compatible with HF 1.0 torso armour!
The actual figures are kinda garbage but that torso piece is great. Also, the small feet are insanely useful. I would say just get chromastone if you can. Small foot piece, awesome torso, metru blue, and those magenta spikes.