Tried it for the first time a couple Saturdays ago and returned twice. It's on Lincoln where Eclissi (which went out of business before I ever tried it) was located. Needless to say with a name like "El Fuego" they aren't shy with the spices (which for me is a good thing). Given that I've gone three times in as many weeks - I think it's very good.
The space is small - but the owner just got permits to expand into the next door location. I wish him the best! It definitely fits a nice niche with the more upscale Yolo and Libertad in downtown Skokie.