Agreed – we have sent many NTSC discs to PAL countries and have a better then 95% success rate. If your user has a 10 year old player, then you should expect a problem. If however, and let’s face it, if the player of choice has been purchased in the past 2 years (90% of players have been sold since the prices dropped to $30/player) — you should be all set.
Good luck
– Jim