Well, they were actually mostly pretty chillaxed and they did have animal handlers there and advising, so while I wouldn't necessarily let mine go along (although Dave would love that many cats to make friends with!) I think it wasn't too bad. There was a couple of bops on the head and hisses but as it was new territory to all of them there didn't appear to be too many issues as far as that went. The gap in the wall was a total oversight though.
The end advert is rather lovely and they don't sell the displayed furniture for full price if at all and a couple of hours followed by the cleaning they showed afterwards wouldn't have left behind many allergens at all. Just think of how many people interact with the furniture every day!