I went from an Audio Research Ls-15 to MW 36.5 years ago. Huge improvement. No doubt the separate MW power supply would improve things, and I guess one might find a preamp which suits his taste slightly more, with an infinite budget. Better ergonomics can be had. Considering that an improvement would run $5 - 20K, I have no desire to upgrade from the 36.5.
The LS100 is the first preamp I tried and it remains in my main system. I am partial to the sound of 6sn7s, and at least in my experience I have not found bass bloat while using either Black Treasure CV181s, Sophia Electric 6sn7s, or NOS Sylvania 6sn7s.
I have owned my LS 100 since 2011 and have no desire to change it. Before that I had a number of line stages ( Melos, Simaudio, Audible Illusions, Audio Note M zero) and passive preamps, none stayed in my system as long as the LS 100.
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