I've got one, thought I had some pictures of it opened up for maint but I don't. It's not hard, bolt to open the clamshell is in an spot where you can't get a impact driver on it making it a little frustrating. Replacing the blades doesn't take long, I'm at about 30 hrs and just put in a new set but it was a little over due. Replacing the anvil takes a little more effort than the blades but has great access.
Overall I'm happy with it but I really wish it had dual rollers, it's had a lot of stuff that needed help to feed and the whole reason for hydro feed was so I didn't have to babysit it as much.
Overall performance like I said I've got about 30 hours on it and I've chipped probably 40-50 yards of material. I clear one weekend then chip the next. Chips are used for hog bedding and they compost it. Most of the garden is planted in the compost now. It doesn't like to feed vines but I've found if I feed vines with branches or larger material it will doesn't care, if you feed vines alone they are almost guaranteed to wrap around the feed wheel and gum up the works.
I'd buy it again.