I wouldn't mind having one nearby to practice or test out my gear.
They typically don't let you bring anything but your mask and computer to protect the quality of the water.
Nemo 33 is very warm, no need for exposure suit, and they don't allow anything but a bathing suit and rashguard type top but even the top is not necessary. They provide fins, regulators and BCDs. and the tanks are 12L short steel tanks that are very heavy...without exposure suit everyone is over-weighted by the tanks so no weights are needed or allowed.
TODI allows the most personal gear. In addition to mask and computer, one can bring their own wetsuit, regulators, full foot fins, and camera equipment. They have a tub that you have to dunk and rinse your gear in to disinfect it as measure to protect the health of the fish. They provide the tanks, BCDs, and weight pouches. The average depth at TODI is between 4 meters and 6 meters, the deepest part is 10 meters in the very center of the pool under some pipes.
At 25 euros for a 45 minute session at NEMO and 35 euros for a session at TODI it is not all that economical to dive these place with any frequency, nor would one want to.
Most divers in the region are a member of a dive club, and most dive clubs hold pool sessions once a week at a community pool.
The region I live in is currently plagued by 2 issues.....one everything is currently closed due to covid restrictions, and a lot of the community pools are old and are being shut down due to the high costs of maintenance and refurbishment.
The club I am a part of is only currently affected by the covid restrictions but the pool we use almost closed for good a number of months ago.
-Z