The larger grinders such as the SJ, Major or conicals such as the M7D, Kony, Robur and the like are great if you have the room and can get it past the wife. Dose retention issues on the conicals is over stated. I find none at all on the Mazzer Robur. I have a doser model which I like. I have had it less than a week but honestly I'm surprised just how good it is. It cost $650 and got new burrs in January. It will probably last a thousand years give or take. These larger grinders purchased second hand can be very good value, for no more than a Quamar 50 or a Macap M4D you can get a grinder that will do an awesome job and you can sell it for what you bought it for at any time. I don't always buy second hand but it is a good way to test the waters if you want to try something. If you really love it then you can buy new but most of these commercial grinders last so long it is almost pointless buying new. The biggest advantage of the smaller grinders designed for home use primarily is that they don't look out of place in a kitchen whereas very big grinders may do and might not even fit under a cupboard or in a corner. The M4D my wife says is 'beautiful', the Robur she describes as a 'monster' and said something about 'putting her foot down'. I have no idea what she intends but...🙂
