Hello Jstones. Yes, I still own a pair of M-100's. They are still in active duty in my brother inlaws rig driving Meadowlarks. These are the later itterations of the earlier industrial versions[ the Grant -Lumley's looked like large dyna mk3's]which I used as well. I purchased them from a dealer here in Canada to drive a pair of acoustat 2+2's way back in the early 80's. They are geniune workhorses,beautiful sounding amplifiers with great trannies that are capable of driving low impedance loads. They have been super reliable as well.Other than retubing and changing out the coupling caps,mine are a completely stock circuit. Originally imported with Genelex kt-88, retubed with 6550c's about 4 years ago. They are very lush or tubey sounding in comparison to the ARC stuff from the same era, however they do create a deap and expansive stage. The larger M-150's and m-200's were not even in the same league sonically! If they are fully stock,reasonably priced and without any issues....buy em,its a no brainer as it would cost you dearly to buy that quality in today's current offerings.