Bah! I have solids on my car. I LOVE them. Cruising is not an issue - they vibrate a bit at certain RPMs, but not all the way across the band - the benefits of driving a naturally balanced inline 6. I imagine they'd be pretty harsh on a little 4 banger or a big V8, though!
They make the car feel more like a sports car - you can feel the growl when you stomp on the throttle. I was never fond of the Grand Touring squishy suspension and feel, and this helps me get rid of it.
They give you more power to the ground, as your engine isn't spending precious power vibrating rubber. They don't break - we've had people here with enough power that they run through stock mounts about every 6 months. Your engine is mounted to the frame, so it doesn't move in ralation to the frame - meaning you don't need a flex section for your exhaust anymore, and you don't need flexible hangers for your enhaust either, you can just weld it right onto the frame if you decide to. They are also a fraction of the cost of new stock mounts.
