Quandary

@rvpiano I’ll going to play devil’s advocate here for a minute…

I want to say that a $300 home audition of an amplifier doesn’t sound that great…on the surface. But consider this - he will bring the amp, set it up, then come pick it up when you’re done with the audition. You don’t have to wrestle a 100lb amplifier into your room, out of the box and into your component rack, then back in the box after you’re done. He charges less than the Cable Company (they charge 5% + tax + shipping…they do apply this amount toward the purchase though). So if he does the same thing, I don’t think it’s ridiculous. 
However, you can pick up this XA30.8 amp used and do all this yourself. Sell it if you don’t like it.
As to sound quality…anything from Pass is more natural and warmer than the Benchmark stuff.
 

Just my thoughts. 

@rvpiano I owned XA30.8 and its a spectacular amp. It leaves class A after 30w if your system demands more power and produces over 100w into 8ohm in Class A/B so it has plenty of juice. 
It should be nice with the ribbons in the GE speakers. 

@rvpiano amplifier is one of the most impactful components in the system and introducing a different amp is a major change. Your system is tuned to the sound you like with the benchmark in your system. That includes all of your cabling. New amp is rarely a plug and play type of component.
You have to be able to hear the potential and commit to making additional changes if you change your amp, including cables and even a preamp. Ultimately it boils down to personal preference. If you don’t miss pass amp when it’s gone, then it’s not for you.