they're pretty much all semi tame! even the ones that like being picked up only want that to happen on their terms!
the silent spinner is quite possibly a little small for him now that he's fully grown. i had one for my first chin and he loved his too, slept in it and all, so cute! some chins eat them but some don't. however, for a full grown chin, especially one at over 600g, you really want a 15in dia wheel as a smaller wheel can cause problems with their back. so if you're getting a new one, it'd be a good idea to get a metal one - i have the flying saucers
http://www.shelfridges.co.uk/flyingsaucerwheel/ - they are expensive but they are very good. i know there's also a large 15in dia metal upright wheel available, somewhere.
do be careful to do the food change gradually, ideally over a month period. this is because the bacteria in chin's gut takes this long to adjust.
chinchi did shed one year and i did brush him - i bought some chinchilla combs from germany and he hated them but would tolerate the soft metal bent spike cat brush. actually quite liked it! he only had matted bits by his tail and i pulled them out.