I had a similar situation, but I had him go with PEX and sweat connections. I suppose I would have considered it for a connection in my garage, but this was deep in my crawl space in an area where you only visit if you absolutely have to. Not a place to mess around with products that have half the life expectancy of the tried-and-true methods.

I wonder if any builders are using this approach - solder in the crawl space and behind drywall, but shark bite in accessible areas.