I have one Aero precision lower/SOTA upper that is a really good shooter. This was my first AR purchase (previous experience had just been shooting my brothers) and I am pleased with my rifle.
This peaked my interest in "building" my own AR15. All the web research I did it seemed the majority had positive experiences with Aero.
So I ordered me a "Freedom" model lower from them, ordered a PSA LPK, and stock kit and assembled my first lower. Next I decided to just buy a complete upper and I chose an Aero M4E1 but they were out of stock. Since this was my first build I emailed them in regard to the status of the upper coming back in stock. Within 24 hours I had a reply from them telling me the upper could be expected to be in stock the following week. And that was correct, I kept checking the website and missed the next batch (this was my fault because I never logged in on their website, so it was showing out of stock, but if I had logged in it would have showed in stock).
So I emailed them again to check when they could be expected back in stock a second time. Again, within 24 hours I had a reply telling me it would be approximately 1-2 weeks before they were back in stock. This time I logged in and 10 days later I had my upper on order and I received it within one week from when I placed my order.
I put the Aero upper on the Aero lower and they fit very good together. and the black finish on each match really nice.
I by no means am an AR15 expert, but I am learning the platform. Been mainly a bolt action guy. But just wanted to share my very positive experience in dealing with Aero as a new customer.
Edit: If you order from Aero direct make sure you sign up for their "Weekly Deals", this saved me $30 on my BCG & Charging Handle, plus everything was Free Shipping so that was an added bonus too.