Of course they are really worth the wait. They are very crisp and remind me of your Iron Hands Different coulour scheme is refreshing, and masterfully executed.
The thing I'm still debating is if I condone the blue eyes or not. I'm wondering if a contrasting colour wouldn't bring out their stare more; but on the other hand the OSL on the blue blends in nicely with the white and how you shaded the helmets. It seems we have different views on that, I remember bronze firedragons where I advocated painting all the gems green, you did take that up but went for purple, which added some contrast and made the model work, without going into the complimentary colour territory as I proposed. Different tastes I guess, and I'm not saying mine is more valid. That's why we all lurk in project logs, to see different perspectives on how to paint.
And I must echo the sentiment on the banner, perfect colour choices. It just occured to me that it works for the same reason eldar helmets work: inverted colour proportions (here, more red than black) + an extra one (eldar: eyes or gems, banner: the beast). It blends in with the colour scheme while having a touch of its to own to set it apart.
As a more general comment what I like on your work is simple bases. I am truly convinced that you don't need to go OTT with them, as many people do. True there are some awesome bases at times, but when every mini on your army is standing on a hero rock or on top of a wrecked Land Raider it goes too far: takes the focus away from the mini and looks out of place on battlefields that are nowhere near as detailed.