I used it for the details window that you could go to, and which showed information like VRAM that normally electronics stores wouldn't advertise. I'd go to each computer I was interested in buying in the showroom and bring up the details window in order to compare them.
Of course, in recent years, a lot of vendors have disabled desktop access and have instead displayed a custom app that displayed the computer specs, which wasn't helpful to me either.
That is a good point, I didn't even think of it like that! but yeah I've noticed that here in Australia too, the demo machines tend to be locked these days running a custom app with the specs or in some cases just locked.