Probably the most disappointing mike that I've used is the Neumann TLM-103. I work with a producer on a regular basis who has one. The TLM-103 is a Neumann, so it is a quality, well-built mic. The problem is that when we have set it up for vocals with another microphone, we always decide to use the other mic. It has lost against an Audio-Technica 4050, an AKG 414EB and ULS, A RØDE Classic, and my Equitek 200 to mention a few. It always sounds thin. I would guess there is a use for it, but I haven't found it and it just sits in the box, at least when I'm around.