My experience with public indoor ranges is limited to the NRA headquarters range in Fairfax VA.
It's well maintained, well ventilated and is closed for cleaning and maintenance enough to suggest that proper cleaning and maintenance actually gets done.
Ammo was almost always available, even in the midst of a shortage at very attractive prices, with no effort to gouge or charge more than MSRP.
I'd usually go on a weekday, leaving early enough to drive opposite to rush hour traffic in order to arrive just before the range would open at 8am and there'd usually be no waiting. On the average week day, there'd also usually be no line, so you could over stay your appointed hour with their permission.
If I shot on a weekend, I'd leave earlier to get there 30-45 minutes prior to 8am to make the first flight of shooters. If not, you waited up to an hour for a lane to open.
The primary benefit of the range was their computerized target system that you could set at any range from 1 to 50 yards and program to expose the target for various times and sequences. Shooting there a couple times a week really helped me improve and maintain my speed and accuracy in drawing from concealment and shooting during brief target exposures at social shooting distances.
A primary complaint was that my ability to do those kinds of drills depended in large part on who the range officer was at the time. Some of the more experienced ROs were very good at detecting who was competent and draw and shoot without putting a divot in the floor, while the less experienced imposed the same restrictions on everyone, limiting you to the low ready position. I encountered one who would not even allow a low ready start, but that was a one time occurrence.
Not that I can blame them, as another complaint was that I saw some incredible idiots there, doing incredibly stupid stuff that ensured that I took care to stay behind the bullet resistant glass that separated shooting positions. To be fair, that is by no means indoor range specific, but I suspect suburban indoor ranges tend to see a greater share of people who were not raised with firearms and were not ingrained with the basic safety rules.
The final complaint was that one of the more common firearms encountered at the NRA headquarters range were AR-15s, more often than not with 16" barrels. 16" AR-15s are loud in an indoor range, and an AR-15 toting moron doing mag dumps in the lane next to you sucks the fun right out of it, even with plugs and muffs. That level of noise is very fatiguing.
Now, again to be fair, I also took some perverse pleasure in the evil black rifle shooters at the range, as the NRA threw the EBR crowd (and I'm a proud member in good standing) under the bus in 1994 when they caved into the 1994 AWB in exchange for some weak promises to preserve hunting access for their Elmer Fudd membership. In doing that they badly mistook who their members were. They are less likely to make that mistake again if any of the suits upstairs ever bother to look at who is shooting with what downstairs.
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After shooting on the range, I'd wash up and get breakfast in the cafeteria, and then hang out in the Museum for an hour or two to let the traffic die down before driving home.
In that regard, it's also the cafeteria, and the museum that made the range worth the trip. I've never had a desire to just drive to an indoor range.
