I got the Soldier and Lurker in the mail yesterday, the Soldier is really cool! The detail is good for the size scale, the paint looks good, there's some minor plastic "flash" I could trim off with some model kit tools and the joints are a little bit on the loose side (and it really can't stand up without the base, but I'm okay with that), on the whole I really like it!
At $20+ a pop I'd find it hard to justify "army building" with them in order to have them fight Star Wars or GI Joe guys or something, but I'm glad I dropped the coin to get one of them.
The Lurker is identical to the Soldier, but has a different head and a slightly different paint job. The Soldier has some brown drybrushing on it, and the Lurker is all glossy black. Unfortunately my Lurker was defective - it was totally missing the translucent dome over the top of the head. I'll be mailing it back to BBTS and getting a replacement.
Both figures come with a ton of alternate hands, but they're all so similar to each other that I don't really see the point. They also both come with a to-scale facehugger which is pretty cool, and the Lurker has a closed egg accessory and the Soldier has an open egg accessory.
I'm looking forward to the Spitter and Boiler, especially the Boiler. Based on the production photos it's not a straight "repaint with a new head" like the Lurker/Soldier are, it's actually got different limbs and stuff with the weird boils and growths and whatnot.