I've owned a pair of Apogee Stages since 1991.
Others that have tried and failed to succeed them; Bose 901 v5 stacked with either Bose crossover, or a Heathkit AD-1702 and REL Storm Sub (I still don't get it), Braun L810, ADS, Mission, NHT, Dynaudio, Bud Fried Signatures, Ohm C2 (4-Quad), Canton, Polk SDA, KEF 104, Pioneer CS-99A (4-Quad)
Others that have tried and failed to succeed them; Bose 901 v5 stacked with either Bose crossover, or a Heathkit AD-1702 and REL Storm Sub (I still don't get it), Braun L810, ADS, Mission, NHT, Dynaudio, Bud Fried Signatures, Ohm C2 (4-Quad), Canton, Polk SDA, KEF 104, Pioneer CS-99A (4-Quad)