My local dive store has encouraged divers to bring their regs to the shop and test them on a full tank prior to a trip, and have even said it's okay if we want to take our gear in the pool next door* (*the pool isn't run by the store but by a health club they have an arrangement with). I currently don't have a reg of my own yet, so right now I just inspect and test my BCD before a trip by orally inflating it full and checking for leaks, checking that the dump cords function & show no wear, and that the integrated weight pockets securely fasten into place. However, when I do buy a reg, I plan to bring both it and my BCD to the store for testing prior to a trip. I know from past experience that not all foreign locations have rental gear available if something goes wrong, so I'd prefer to know about any potential problems while I can still get them fixed. I'm paranoid like that!