Hi
Paypal takes fee for every transaction, in percentage and if the sum they are sending you is abig sum. This could be quite a lot of money!
One thing u can do to make sure he sends it to you Paypal account is to give him a rebate which amounts to the sum paypal are taking! This way making sure you get the money to Paypal!
We do a lot of wire transfers and if they company paid you before, I do not think you have to be afraind. I mean, you have done business before and they want the links, not to cheat you of money!