All my prebans are Eagle Arms. Only prebans I will own. They did not acquire the rights to the ArmaLite name until after the ban. The quality of the preban Eagles is as good as the new ArmaLites, of which I have several. The only real difference in the postban Eagles and the new ArmaLites is the chrome moly barrel on the Eagle vs the chrome lined on the ArmaLites.
Given that you say it has a brake instead of a flash hider, I take it that it is a postban. How much are they asking for it? I would rather have an Eagle, pre or post, than ANY other brand except, of course, a postban ArmaLite. I had a postban Eagle and sold it to get a new ArmaLite. That is the only one I would have sold it for.
Something else to consider after you get your Eagle is to go to your nearest ArmaLite FFL and order an AR180B. They are back ordered, so just give him a deposit and be patient. It will be several months before you get it. It would be a perfect compliment to your AR15 type rifles. MSRP is $650, probably get from your dealer for a little less than that.