I like to use Calumet as you are a professional suppler. From an educational point where management's decision is normally lead by price alone; generally they go for the cheapest option which is not necessarily the best. Coming from a professional background I do not mind spending slightly more for the products when you have good customer support and back up. Knowing there is a structure in place to deliver products or services within a couple of hours if necessary is reassuring and the fact that orders can be made over the phone with out time wasting paperwork.