Definitely an improvement on the old style
I have noticed that there are many great features on the new grinder heads we have been using at work. Probably the most noticeable is the amount of time we are saving by not having to stop all the time to replace the cutting teeth so often. Of course we still have to replace them but nowhere near as often as we normally would. The new design means that the teeth are supported from behind so this stops them from being bent backwards and breaking so easily. The way they are positioned means that when we do have to change them, it is easy to do, unlike in the past where it would take a fair bit of time to do.