If Xur had the ability to focus specific weapons (with origin traits and enhancement that were recently added to his pool), and another focus for red border weapons in his pool (at higher cost), then he may be useful. Right now, he honestly has little to no use other than to top off on materials that he has. Cant even rank him up anymore, so once I top off on materials, I just sit on the rest of the coins until the next week. His weapon pool is inflated with junk from the beginning of time now... so getting random weapons from his engram is a cause of more frustration than help at this point (unless you enjoy tedium and want to try for red borders, but I would not put deepsight harmonizers on any of those weapons anymore since the source is dried up). Xur is the perfect example of a good idea with horrible implementation. Really only useful for only people who want quick class item rolls at this point.