Other membership-required communities have to vote in a special assessment (e.g. Mirasol is currently voting on a $40,000,000 improvement on the gym and EVERY resident will have to pay their share of this assessment even if they never go to the gym.
We looked at houses in BallenIsles, Mirasol, and Frenchman's Creek and we found that the per square foot cost of the houses was cheaper presumably because one has to pay for membership.
PGA National primarily 1980/90's homes, so prices are lower but will have higher cost of insurance than new construction. Good luck on your search, let me know if need more info. firstname.lastname@example.org
Those would be the 'downsides'.
On a more positive note, the cost of living there is much lower then in the surrounding communities and Membership is not required. However if you do want a golf membership, it is the lease expensive in the area and you get access to 5 courses - 4 on site and a fifth a few miles out west.
Don't be confused by the previous answer! Unless you are staying at the hotel you can NOT play on any of the courses unless you have a membership. Trust me, I live there!