I am rather new to PM having had the Boeing GC, MCP and CDU running for only about a month with a few Opencockpits hardware modules. It all runs ok using the FSX default 737 fleet. My question is am I losing anything by using the FSX aircraft model or would I get more realism by buying a payware 737 aircraft such as 737 Pilot in command or others if there are any suitable for FSX.