I used to be completely loyal to Riedel, thinking since they invested so much into research that they deserve the spoils. They lost me, however, when they created the "Restaurant" line which don't break as easily, AND which you and I cannot buy. I've replaced all of my broken Riedel Vinum Burgundy and Bordeaux glasses with Spiegelau, and I'm quite happy with them. Less lead in the glass (big deal), essentially the same shape, thicker stems, about half the price - works for me! Obviously, they get my recommendation. Good luck!
De gustibus non est disputandum.