Yes, I ran my '13 650 max xt with just front spacers fro over 5000 kms with no issues and the ride was significantly improved over stock. I am now running the fox upgrade shocks and they are better and do not require the front spacers but....... as soon as I add a passenger, I'm dragging the ass end over every rock on the trail. Not happy with that, definitely not a worthwhile upgrade for a max.
If you want better suspension go aftermarket, money better spent.
If you want better suspension go aftermarket, money better spent.