I don't doubt ITZPS's accounts of problems with the 9s. Bowlers are different and put different demands on shoes. For any model shoe (9s, SST8, TPU-X, 3G), some bowlers can go years with no issues, while others find a way to destroy the same shoe within a few months.
After 5 years of happy life on my SST8's, I tried the 9s because they were the new shinny toy on the shelf. They've been good overall. I'm not sure I'm any happier with them than I was with my SST8s, but they're holding up so far. I dig hard on my pivot step, and my 9s are showing more wear than I'm happy with. Yea, I've logged about 500 games on them, but my SST8's had about 2000 games before I saw the same amount of front shoe wear. I'll soon put on a new sole/toe combo, but that means Ill be spending about $75 per year to keep my 9s alive.
I bought the Pyramid TPX shoes because I had heard so much about TPU-X comfort. They are like wearing extremely comfortable running shoes, but they lack the rigidity and construction strength of the 9s. The front part of my HPXs are wearing much faster that my 9s, and I don't expect them to last more than a few months. If the TPU-X/HPX shoes had a more industrial strength toe area, they could possibly be the perfect shoe. Maybe they'll make meaningful improvements in the future.