I've purchased several packs from them. M4A2 Russian 76, T-34E, KV-1E, KV-1B 756r, and the Pz-IIH. I've had a blast with all of them and think they're well worth it. I could care less for the Tier IV/V tanks so all my time is in the Tier II/III range.
I treat myself to some Golden Eagles once every two weeks just for the hell of it. I've still got 30 days of Premium account which I believe is more than plenty to grind the rest of my way and get what I want.