Thanks for the comments all.
After reading that the supercharger is an Eaton MP62 (distributed in the US by Magnuson) I am having second thoughts about buying the 2-Eleven. This is the same SC that self-destructed in my track MX5 recently and took out my engine. They have been the SC of choice by a considerable number of street driven Miatas in the US where a number of similar failures have also been recorded, some at an early age like mine (< 5000kms mostly on the street). They may be OK in a street car application but I have serious doubts about their suitability for extended track use where they are on boost for prolonged periods. Jo, I acknowledge that you have had about 60 track days with no SC worries, but it seems that failures are erratic with the majority of installations providing a long trouble free life.
If at any time you hear a rattling sound (like a can full of gravel) coming from the engine bay, stop immediately as it will most likely be the sound of SC rotors clashing after a rear bearing failure.
Please don't take these comments as a slur against the 2-Eleven. I still think they are a terrific car that I would love to own. However my experience with my SC has forever soured me against Eaton superchargers.