I think it's more a matter of nerves. If you are confident, go ahead. But if not, what would it hurt? I have often had another person fly a new plane of mine for the first time just cuz my knees were knocking. I haven't had that problem on this go around, and have maidened five planes this year.

Still knocking on wood though. I haven't had a crash since 2001. But I took an RC sabbatical from 2002-2004.