Weirdly I just bought that hex bug thing last week. My two just stare at it, just like the video shows the kitties doing, no different. You want a toy that makes your cat chase, run, jump, pounce after it like it would a real prey. If you already have a wand/fishing pole type toy, you may need to invest in several different types of "lures" and switch them around to keep it interesting for your kitty. Multiple play sessions are always great, too. You don't need to go for 1 hour...15-20 minutes is usually enough, followed by their meals will put them right to grooming and sleep mode!
This vid shows "Da Bird", but I think they have one in the UK called "Flying Frenzy" and have multiple lures you can switch out. You need to make sure the cat gets an intense
workout, btw, not some lazy twirling from your couch or standing in one place. I usually walk room to room and make my kitty leap and chase after their prey toys on sofas, behind corners, on beds, their cat trees, window sills, etc. I
get a cardio workout too, in the end!