Spectron Musician III Signature vs VTL Siegfried?

I have the Musician III Signature two months. In my review, a month ago, I wrote:

"the sound, excellent to begin with, dramatically changed for the better. The highs became something magical, I never heard such in any solid state or tube amplifier. Totally silky and extended to heaven!!!! The "see thru" soundstage became immensely three-dimensional, truly, I feel sometimes that I can touch musician, go around him or her, and soundstage huge to begin with became even more specious! Midrange became "alive" like in the best tube amplifiers I ever owned or even auditioned, its magic feeling!!!! Base have now both: more authority and startling clarity - so different from one-note solid state and mushy tube base. I can play it quietly and I can play it loudly - no slightest strain. Additionally, black background became even blacker again as never in any other amplifier I auditioned in the past. It adds to the overall "magic".

Last week, I got well broken in VTL Siegfried monoblocks for a a few days of auditioning. Spectron cost $$6.5k, Siegfried - $35k. Spectron weight 50 lbs, Siegfried - 360 lbs. Both declare power into 8 Ohms - 600 watts and and into 4 Ohms - 800 watts. Headroom, Spectron 3600 watts over 330 msec, Siegfried - unknown. As a matter of fact, VTL except power and few others does not disclose its specs even such important as bandwidth and distortions.

OK, playing - both show big soundstage and good imaging. Treble is Spectron's domain, VTL sound simply murky and veil. Midrange is warmer in tube amp, very pleasant on ear. Bass - here is my problem. First, I though VTL bass is better - weightier and richer. Next I compare a few discs and to my surprise I am starting to believe that this monster tube amp bass is full of distortions, full of warm rich details which are not present at all in cello which I played and Spectron is accurate and after few days even surprisingly for me, I fall in love with Spectron bass - rich weighty. Perhaps, one detail. I am not sure I can physically hear deep bass but I can feel it, my chest is "shaking" my listening chair leather is vibrating etc. I hear it in Spectron very much and just a little bit with Siegfried.
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I am eager to know if anybody else have experience with Musician III Signature vs best tube amplifiers? Thank you very much for reply