So they don't like the G70 - so what? What's a big deal?

Especially if someone makes up their mind having tried the instrument, albeit for only 10 minutes.

Just let them be. Defend the G70, do not offend the other guy. And if they chose another instrument, let it be their problem. You know your G70 is the best - let them choose another brand, it will be less competition to you. After all, if you know your board is the best, why do you need others to tell you that?

BTW, feel free to substitute any make/model of any product for "G70"