No, it really was not worth it in the end.
Tried it several times and a few ways, with the same of each amp. Vertical and horizontal configs. It could sound "exciting" at first, but never convinced me to stick that way for longn. Seemed less musically coherent somehow (there can be slight differences in units of even the same model of an amp). Not good results with bridging SS amps to mono, either. What I didn't try is biamping with disparate amps (like tubes up top) - but honestly the coherence issue when biamping with the same SS amp turned me off that idea.
What CAN make a big positive difference is taking two stereo tube amps that can be switched (paralleled) into mono, and running them as monos.
This was done with Tannoys that are relatively efficient.