I agree, GZG 15s are great, the best on the market for the price. When I could budget for them, I'd put in a large order. Shipping costs at the time were reasonable. The 'Stargate-ish' aliens were perfect for one of my pirate bands. I'm been pleased how they increased their civilian mini lines. They also have a greater variation then most wargame unit sets. The only drawback is the children minis are a little out of scale with adults. Stargrunt seems also to limited in interesting aliens suitable for Traveller(though this may be an unfair criticism since I've never read the rules).
My GZG 15s arrived the other day, and I have to say they are fantastic! I'm really, really impressed by the quality. Sure, there was some flash, mold lines, what-have-you, but that's to be expected.
Now I have a bunch of guys (and gals) in vacc suits, heavy vacc suits, some of them floating in space in said vacc suits, some armed, some carrying toolkits, etc., and in addition I picked up a pack of civilians, including two guys in dusters with stetsons.
Brilliant!