Guess I must have been lucky as my Airport Express II has always worked just fine, even with an outdoor crowd of 4000 people on MLK day. I do hook up on 5Ghz but was walking line of sight 130 feet away.
I've been luckier than a lot of my clients - I run an IT business providing IT consulting, sales and the like to small/medium businesses primarily and some enterprise applications.
Some of these businesses try to get by on a shoestring budget and they deploy less than adequate solutions, such as an Airport in a business environment.
When talking to them they say everything is great, except, jenny gets disconnected sometimes, and oh yeah, the entire wireless network "blipped" and everyone was off for a few minutes, but it's really not that big of a deal.
Then, it happens - a custom database application ends up getting totally whacked out and nobody can work. All because one person dropped off the network during a big data move and it takes restoring a backup losing some data they already input for the day, or trying to fix the corrupted tables.
I put monitoring solutions in place and show them they are getting these glitches every day or two - it's not a lot, but it doesn't take much....
It comes down to an airport being the issue - it just stops pinging (on the wired network), or the radio resets or something and then the wireless just goes away for a few seconds. Even right up on the device.
I had a service monitor on one once, and just happened to catch the signal vanishing.
This has happened with at least 20 clients of mine. It's always an airport... always.
We put a single AP in place from a brand such as Aruba, SonicWall, Cisco, even Ubiquiti and never another glitch - ever....
But these are businesses, I'm sure your typical home and maybe sound company doesn't care that much.
It's the same though with low end linksys, trendnet, tp-link, netgear, etc. These are home systems and should not be on a business network.
We're all lucky to get anything that works at all on the budgets we have... hahaha