Those at least are easy to use! And they fit into very many systems.
Well that's true. Actually I don't have that many D6s so it was kinda fun to roll them

How would you rate your experience so far?
I'd say it's been a fun project so far. I'm not really a fan of Mantic's minis and especially not of the strange plastic these ones are made of. Having said that I have been using some of their Terrain Crate stuff for my HeroQuest games and it's worked well.
I grabbed a copy of the advent partly for some sci-fi terrain and partly to try something new; I'm autistic so what I do and don't like tends to be VERY specific but I thought that this being a self-contained little project would be a fun go at something new without a strain on my limited hobby budget.
My son has already asked if we can play when it'd all painted and both my kids enjoy seeing what I get each day.