It's a nightmare. If it was at least reliable, it wouldn't be too bad. The one I serviced had solenoids underneath for hot water, cold water, and spot free that ran through the pump. There were no shutoffs for any of them, so any time one had to be changed the whole wash had to be shut down, up to two other solenoid cartridges had to be removed to get to the bad one, and you're practically lying on the floor. The injectors are problematic and also an hour-long job to replace, there are two regulators and many chemical solenoids for each pump that have lots of problems, they had bins full of thousands of dollars of spare parts to keep the thing running, and on top of that it's super finicky to get it to work right. There's a bay down every other time I go by it, and maybe every tenth time I go by the whole wash is shut down. It's been like that since it was installed in 2016. The first time I worked on it was in 2017, and it had three of six bays not working because of failed solenoids/injectors.
The funniest thing is that the whole concept is to save space, but it gobbles up chemicals so bad that they had to do the same thing as the one you pictured, which is have large drums all around it.