I had an e-mail from Fusion inviting me to join for a year with 25% off-I did consider it but am really unhappy with FHP, having only 2 showers we can use in privacy is a disgrace, and I don't like the shared changing rooms. The lanes are too narrow for the ladies only swim on Saturdays.
I'm much happier with Glass Mill. I think Glass Mill is also Fusion so I'm not sure why the difference in quality, it may be down to the staff, or in the case of rubbish the pool users!