I don't think 700 grams is exactly considered a heavy weight for an adult chinchilla. I have a Chin Spin and I adore it even if it's a little hard to attach to the inside of the cage. I like the fact it has such a wide running space as well as the 15 inch diameter. It also takes up less cage space than a silver surfer in my opinion. My girls unfortunately are too young for any wheel just yet but I plan to put the Chin Spin back in when they are 6 months or so.