Polypropylene based rain gear is a subject of great debate. It seems to fit some people's needs perfectly while it is terrible for others. Frogg Toggs is one company, I know DriDucks is another. They both seem to get similar reviews, hot or cold.
The material leads to very lightweight rain gear compared to equally breathable/water resistant materials. So it should be as lightweight if not better than anything out there. Because of this it also offers little to no warmth, so if you are going into cold and rainy weather you will need an under layer.
Many of the complaints are about the durability. I have not had any problem with this but I may not be as hard of my gear as others are. My backpacking trips are mostly weekends on US East Coast. Climates with more rain the durability issue may be worse with packing and unpacking more often. I believe the durability comes from difficulty in assembling the material, which is also why it is never stylish. This issue may be improved as time goes on.
Rain resistance is very good, on par with the best competing materials.