My only other comparison to this harness is the rented ones I use at the gym. So this is definitely way comfier than those. With this, I have the added incentive to go climbing more often.
Sizing wise, I'm quite a tiny person so I got a size 4. I'm normally a UK size 6-8 and I wasn't sure of US sizing so the Chat function above was really useful. I liked the instant reply I have to questions about the product. It's as if you're shopping at the store itself. It helped ease my worries and aided in my purchase.