If I'm remembering correctly, I've been to Phoenix three times and twice when the club operated under "The Forum." All of my visits have been for special events for touring artists, so I have not attended on a regular night.
The club is much smaller since becoming Phoenix, I haven't seen the entire venue used. I like the management and bartenders/staff much better since the switch and I've gotten better vibes from bouncers and security as well.
The sound system is very good, and I've been impressed with the light shows and visuals. The resident DJ's usually open for touring acts and I've been generally impressed, the music is good but incredibly loud...like I'm probably going to need hearing aids in my 30's loud.