Bruce,
Well, let's just say I remember Woodstock and let it go at that

. If I were just starting a practice, regardless of my age, I would seriously consider an IMP. But, after over 20 years in private practice, I think the stress of dumping all my insurances would be cardiogenic suicide. Solo practice has its own herd of tribulations but I would never, ever (I think) go back into a group or an academic practice.
Leslie