My first experience with a synthetic stock was awful, it was a FX Cyclone but had developed the common crack just above the trigger. This put me off the synthetic options for quite some time. I later had a CZ synthetic which although was flexible, was as tough as hell.
I suppose it's down to materials used?
I currently have one on my FX Streamline which feels tough and gives me security in the "less chance to ding and scratch" department but we'll have to see how it goes... if a nice wood stock comes up for sale I will buy it though, nothing quite like the feel of wood on your cheek