I found Shiny Prints early in my evaluation of metal print providers. Like most folks starting out with metal, I didn't know what I didn't know about this particular process. Will (an owner) was spectacular in guiding me through the initial order process and "beginner's nerves" when it came to getting the best results for my clients. And best results there were, because the SP attention to quality shows, from the proofs to the print to the shipping.
I started with them ultimately because of the customer service. I stay with them (and vociferously recommend them whenever an appropriate opportunity arises) because the service has remained high and the quality is stellar.
These links are affiliate links but also provide a discount to you on your first order if you choose to use them. https://shinyprints.com/c/BB2382