It's not surprising that someone's "overrated" is someone else's "dream come true!"
Why?
Because shafts make or break a driver as compared to irons. A routine fitting (where you might try 3-5 shafts) may still leave you not finding the right combo of head / shaft for your swing.
Landing on a different manufacturer can follow, of course, if your fitting was less than stellar.
After all, if the fitting was exceptional chances are high that you wouldn't feel the need to switch.