Soft top

I've seen some posts about soft tops. Cabinet maker John looks like he has a soft top on his tear. Is this a good Idea? And if so why don't more people do it. It looks really slick and I don't think that rain would be too much of a problem... if you use the right materials. I could see it being a little colder, but camping in the southwest stays pretty warm. Let me know if anyone has expierience with this. Wil