I was an early buyer of AMK, and mine has been a good performer for me. Being made of primarily Aluminum has not been a detractor in any way--they sell a small wheel adapter, you simply undo two hex head cap screws and pull the flat platen and place the small wheel attachment on there--I change mine out in about 1 minute- the one they sell works well, the owner Alan will tell you that one needs to run the small wheels slower since their bearings are smaller--so I do--been using mine for about 18 months and no issues with my small wheels at all. The contact wheel they sell the unit with works very well, and mine has shown no wear at all in the time I've had it. All in all I like my AMK--my second grinder was/is a Northridge and it is a better grinder to me, but it was quite a bit more $ for sure.
I don't think you will have any issues with an AMK if you go that way.
WTB single blade sheepfoot barlow