Even though I only did a custom ear tips for my own IEMs, the service was excellent from start (making the ear impression) to finish. The packaging was spot on as well with a box that looked and feel of top quality materials.(you'll never expect that kind of packaging from any product ever) to keep your IEMs. The certificate of authentication with your name on it was a nice touch as well to the premium feeling product/service.
The only issue I had was the long waiting time. I was told 6-8 weeks, but instead waited for about 10.5 weeks. Don't get me wrong, I'm fine with waiting. Just that it will be better to under promise and over deliver, in fact it will be even better if I was told to wait 12-16 weeks.
Overall I had a great experience with Null Audio/ AAW. Will definitely buy again if I have the chance. Cheers