Actually Art did review the SPe/HE in the new August issue of Stereophile, and quite favorably I must say. He said that he liked them better than the LX Signatures, but he admits that he has changed out a lot of things in his system since he reviewed them and for the better. He also admits that it was over 2 years ago since his LX Signature review and that his memory of what they were like may be dusty.
I heard the SPe HE being driven by all AN equipment last year at RMAF. And for the money they are by far the best sounding AN-E I have heard. However, using the same gear any of the AN speakers with the external crossovers, including the LX Signatures will rocket past the SPe HE in terms of refinement, midrange pureness, and low frequency definition and energy.