I brought the super duper professional one when I had shepherd and rotti. If suspended high off a pergola beam, they did enjoy it when I encouraged playing.
However since I've never been in a house since that had a suitable high place to tie it (and tried fences etc)....it was never touched again.
Good thing is it seems to last forever, so one day I'll get another beam to try again
I had the largest one and found that they had difficulty gripping it, so I'd probably go medium next time.