Looks like Windows Galaxy uses and Earthwise window. Decent product but not in the category of the Okna 800 in terms of fit and finish and air tightness.

You cite 48 reviews but that is via a different review engine. You can control those reviews vs the review sites like Yelp and Angie's List.

If you look here, their reviews are a bit less stellar: http://www.yelp.com/biz/window-galaxy-jersey-city

As far as AGM goes, I have heard their name mentioned on here and other boards very favorably.

Looks like AGM uses a much better window and has better reviews. Window galaxy have some bad reviews and they do NOT make their own window regardless of what they tell you.

Paul over at AGM is a good guy. You can't go wrong with him and that Okna 800.

Any here use AGM. Thinking about using him for OKNA 600 windows. Looking for reviews.

Looks like one shop closed (from this thread) and one is still going strong. That should validate the decision to go with one over the other.