Hello, and welcome to AC.
I'm afraid misterclean and I share the same preamp and amp (both are made by Don Sachs), so consider me another Don Sachs 'cheerleader'.

I've had my Model 2 for just under 4 years, and have never considered replacing it.
Here's a link to 4 1/2 years of user comments about the D Sachs Model 2 preamp with reviews and commentary about the Kootenay 120 amp tossed in for good measure.
https://www.audiocircle.com/index.php?topic=138092.msg1470155#msg1470155I have never heard a Supratek, but I have heard very good comments about them. If we were not in the midst of a pandemic, I would have been able to compare my Model 2 to a not very distant fellow's Supratek. However, neither of us wishes to expose the other to potential illness, so it will just have to wait.
Take the plunge and order one, or search for a used unit. Hifishark is a great resource for searching for used gear.
https://www.hifishark.com/Alternatively,
announce your location in the world [
I see you are in Scottsdale, AZ.] to see if anyone near you owns either preamp. Perhaps, a visit could be arranged? I would have loved to attend that speaker demonstration last year. I'm certain it must have been very special. Is there no one in your area with either preamp?
Enjoy your audio journey.
Michael