[mindcrime]

Pursuing the same idea isn't the worst thing you could do. Competition is competition, and - as somebody else already said - if the idea is really good, there are probably other teams working on it already.

BUT... what I personally wouldn't do - just because it would be a dick move - would be to do it behind the guy's back. Tell him what you're thinking about doing, who knows, maybe there is some synergy or what you could work together. Or not. But as long as you're upfront about it, you'll know you did the ethical thing. He might still be a bit pissed, but it won't be anywhere near as bad as just going behind his back and then springing it on him later.

[MrBurns]

Thanks for your reply mindcrime. You're right, we're going be upfront about it and see his reaction. If he's professional in his response and is willing to compromise we might consider working with him.