It's a catchy name but the .ws hasnt ever really caught on in my view, I have never seen anyone branding or using the .ws for a major company or brand.
I think its worth reg fee - best case $xx but I would stick to .com and .net
ya I have a few .ws domains that would be worth some money if they had a different extensions like extra.ws, cookiedough.ws, hotteens.ws, tabletpcs.ws, etc.