I have not used it, but any program that you give free access to download to your machine carries a high risk of virus /trogan infection.
First thing to ask is :-
Is it going to cost anything ?, if so how much ?
If it is free, what is the catch ?
If they contacted you, have they a contact name /address where you can contact them ?
Do they hold a security certificate (i.e. Verisign or similar)
Just food for thought.