For several years I've been on a list for using rotary engines in aircrafts. Those guys do some real engineering and real world testing.What they've found is a super charger robs about 10% HP from the crank for your boost. The turbo will do the same boost from waste kinetic energy blowing our your exhaust. They have no requirement for a muffler, so back pressure is a larger factor for them than us.Use a larger turbo compressor if you want more boost and you will not be wasting the 10% HP.
I agree that the G60 charger is reliable as anything as long as its looked after, 80 degrees oil temp before booting it up, yearly timing belt on the charger changes and good quality oil.