The bras tend to maintain their form for me over the years. If the wires are falling out, it may be how you're washing/drying them. Try putting them in a delicates bag for the wash cycle, then air drying.
I have also found that the lighter materials, such as those on the hooded full-zips or lounge pants, "pill" really easily. The quarter zips are super durable though, and they're definitely my go-to for early morning class.
I've also found that the yoga pants/leggings go through phases where they'll be really good quality, or really poor quality. Don't buy if they feel too thin to begin with!