I have been going to A1 for the past year and a half or so and have always had a great experience going there and no problems.
Yesterday I faced my first problem. The tank I had them drill had a huge scratch going across the front panel when I went to pick it up. I was puzzled as to how this could have happened because my friend went the previous night and it was perfectly fine. It looked like someone dragged a key across the tank. I left the tank at the store and went home pretty pissed.
Paul contacted me the next morning (today) and said that they would be ordering me a brand new tank. (Just a note that I didn't even buy the tank originally from them). He didn't try and talk his way out by saying " we aren't responsible for damage", or "we will give you the drilling for free", or "sorry a customer did that, out of our hands". He said right away "we will replace the tank". Hassle free, no back and forth, just straight to the fix of the problem.
I just want to thank Aquarium One and Paul for keeping customers first and doing the right thing, that gets lost a lot in today's world.