This was a very frustrating first purchase. FedEx is Mile High's carrier of choice for Hazmat shipments. The experience with FedEx was terrible, they continued to say they attempted deliveries when they didn't as someone was home every time, and no door tag was left. I have the FedEx app, and other shipments came in as scheduled. I monitored this shipment closely as an adult signatrure was required. After 3 delivery attempts, they said they were returning the items to the shipper, yet they attempted delivery 2 more times when no one was home, and actually left a door tag this time. Mile High did get in contact with FedEx and tried to assist in having the package delivered later in the day, but that never happened. They did arrange to hold it at a FedEx facility for pickup, not exactly optimal, but i needed my order to begin reloading as I had lost 3 days so far. If FexEx is the only shipping option for hazmat, I would not purchase again. To be fair, this was a first order. I may give them another chance for non-hazmat orders.