The lady I sponsor and will be headed out on the PWBA Tour for 2018 only uses Storm and Roto. After our latest buying binge, she currently has 20+ rocks drilled. The only duplicate ball in her bags....2 IQ Tour Solids.
When we bowl locally, on house shots, there are plenty of better options than IQ Tours and most of the time she doesn't even take them with us. However, when she sees Sport patterns and flatter patterns, the IQs are the first ones out of the bag to help her read the pattern. Her original HyRoad is not far behind.