Sorry for not responding to your post sooner, but I haven't responded for two reasons.
One, I have been really busy and two, I haven't put my Supratek back in my system since I received the Lightspeed to do a head-to-head comparison. I simply don't want to take the Lightspeed out.
Today I had an opportunity to listen for about 45 minutes and it was one of those rare mesmerizing moments that everyone experiences from time-to-time with their systems. I don't know if it was simply an extremely good power day or what, but I didn't want to turn my system off. Never in all my years has my system ever approached this kind of sound.
There is one caveat to my thoughts and it begs me to put my Supratek back into my system for a comparison. Recently, I installed an Oyaide R1 receptacle into my system that feeds my Sound Application RLS. Since installing the R1 outlet, I have had the Lightspeed in my system the entire time. I am sure the R1 has contributed something to the improvement (it replaced an Oyaide SWO-XXX), but I can't imagine the R1 could possibly be responsible for the huge leap my system has taken since the Lightspeed. I won't know until I put my Supratek back in, but I can't bring myself to take the Lightspeed out yet to do the comparison.
I realize I am repeating myself, but the Lightspeed (and R1) is phenomenally transparent with incredible dynamics. Today I briefly listened to Mephisto & Co., Reba McEntire and Peter White's Confidential. They were all glorious. Especially Reba. This particular cd has always been slightly strident and forced. Not today. Smooth as silk and with great palpability. Big, bold and fleshy with warmth and stunning musicality.
When I have time to do some critical listening with my Supratek back in the mix, I will post the results. Regardless of how my Supratek performs, I will say that the Lightspeed has been the best money I have EVER spent in audio. YMMV, but if your system impedances work, I would highly recommend taking a $500 shot on the Lightspeed.
I do realize that listening comparisons are completely subjective in this hobby so take my impressions with a big grain of salt. Should you or enyone else have a differing opinion of the Lightspeed...not a problem. But until I do a shootout with my Supratek, I couldn't be happier with what I am hearing.