After using and abusing the Microspikes all over the place, I'd buy them if they were $100. They are extremely durable. I've stepped on ice and granite all over the place and they are still in great shape.
They're worthless for really steep slopes. You'll need the crampons for that, but they'll save you tons of time and energy for just about everything else. I feel comfortable doing a light jog in them on hard ice.
Used them for a C2C trip last weekend, and would never have made the summit without them.