I have recently made the switch from making gravy with those little bouillon cubes, to using this browning and seasoning sauce that I purchased from my local grocery store. I decided that it would be easier than melting down the little cubes, since this was already in a liquid format.
It is made with a vegetable base, so it is ideal for those who are looking for an alternative to traditional meat-bases gravies. The sauce is also extremely versatile. It can make gravies, sure, but it can also be added to give a punch of flavor in a marinade, placed inside a meatloaf, or to make a reaux for a soup or stew. I also like to add a little into my hamburgers in place of Worcestershire sauce.
Essentially, the browning sauce comes in with a little extra flavor where it's needed. It does have a fairly strong flavor, so I don't recommend using it as a marinade for protein like fish or chicken. It will completely overwhelm the dish and will deem it inedible. Some of the ingredients that come out on a high note in sauce are the onions, celery, and turnips. Overall, I enjoy the flavor of the sauce.