"I have 3 hamsters - 2 Syrains, and one Russian Dwarf - and none of them like this product! They all love their wheels and run-abouts, but none of them will run on this. The Syrians love their 8" Wodent Wheels, and the Dwarf loves his 6.5" Silent Spinner, and they each have their own run-about, as well, in which they each run at least 3 times per night, for 30-40 minutes each time. They LOVE to run, but they literally just sit on the hamtrac. They have tried and tried to use it, but they cannot make it around the curves. As other hamster owners have mentioned, I think the track is too short for them to build up the momentum needed to get all the way around the track. Maybe if you connect two tracks together to make the straight part longer, it might work better, but I don't know."