solar panels good or bad???

Are solar panels worth the cost? Iam seeing many of bldgs with them now.

I got My answer from the experts: Golden Tree Roofing

Thanks for the comments everyone! :)

Does anyone know what there ball park cost is installed? How many panels does it take to be cost effective on say 200 square roof?

Most solar installations are found atop the roof. I wonder what provisions are being made to maintain and service the roof. Also, these devices require numerous roof penetrstions for the structual steel supports, and just to rely on pitch pockets presents another problem for the roofer. And ultimate replacement years hence is an important factor that should be considered in the economics equation.