I think it was a good investment and I'll recoup some of the cost when I sell off my extra lens cones. I was a little worried about it being rigid enough, but it seems to be built pretty darn good. The thing I like is now I can use my 180mm Componon-S. I couldn't and probably never would have found a cone long enough to use the 180mm. I'm going to keep my eyes open for another so I don't have to swap between my D3-dichro and my D3V. Swapping isn't a big problem, but it would make things easier. JohnW