I just finished assembling and installing my record collection (part of it anyway) in a Boltz 3 shelf rack. Pricey yes... strong, the strongest freestanding rack I can find. Highly recommended. I'm ordering another one.
i owned that rack for 5 years until i moved to my new room. it's very solid and well built. mine was the 4 shelf unit (i did not use the wheels) and i did attach it to the wall to make sure it was stable. the 3 shelf unit is likely much more stable.