I am thinking about getting myself the whole 8330 + 7350 + GLM combo. Having similar thoughts about my money well invested, but also not sure if the conventional wisdom of "Use only once" applies here. The thing is, being used ONLY ONCE can be seen as a proof that the GLM is doing it's work properly. If you do not change listening spaces, a good calibration system is a "Fit and forget" solution. Also, something being used this many or that many times tells nothing about the magnitude of difference in performance before/after the use. If they sound horrible before GLM and great after it, it is probably money well spent even in "Used only once" situation (depending on the budget - competition offerings considerations).