I concur. I've used several of them (and paid dearly). What I worry about most is having an A/C crap out and then getting one with a different exhaust shape/size. So, I've bought several of these from Amazon so that I always have a standard size - fits both 5.1" and 5.9" exhaust hoses
And for a recent A/C purchase, the hose didn't screw on to the adapter easily, so I resorted to white duct tape. Works fine, lasts long time
Also, put a sign over the on/off switch warning to make sure the window is open when you start. It can sorta blow back the plexiglass insert if you don't!
Since we moved recently, I had to buy a couple more of the plexiglass screen inserts. I did this in late April and even then, wait time was over a week. So people shouldn't expect to be able to just go in and "get one" when needed.
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Also, put a sign over the on/off switch warning to make sure the window is open when you start. It can sorta blow back the plexiglass insert if you don't!