I have a very suspicious beast, so it did take some time to persuade him this was for his enjoyment and not some cruel trap. Perhaps the garish colour is distracting? Nevertheless, after some gentle coersion (with favourite toys flying through it over the course of a few days) it has eventually become a friendly place and what can only be described as "battle armour". A complete result!
My cat loves this tunnel and plays with it every day. It makes a rustling noise as she runs through, which she seems to like as she likes playing with carrier bags that rustle. A great success!