I've never owned anything cashmere. I could afford it, but I would feel guilty for spending so much on a jumper so never have. But having read lots of threads on here about how warm it is etc. I decided to try first by buying second hand. I bought a gorgeous 100% cashmere jumper (M&S Autograph) off eBay and today am wearing it for the first time.
I'M A CONVERT 
It is so soft. Yet not bulky. And oh my god, so cosy. It's a total revelation!!
I am a bit worried about the care of it (I don't have a great track record when it comes to washing things!) but if I can keep this ok for a while I don't think I'd feel so bad about treating myself to a brand new cashmere piece in the future (or possibly add it to my Christmas/Birthday lists)