If you have had a chance to check them out then that is a good deal. I have a pair of more recent 8x30's, and 15x56's, along with a spotter and they are all wonderful. I never registered by 15's and had to get replacement eye cups. I was worried as the rules say they are supposed to be registered within some predetermined time period that I can not remember. I will say they never blinked, but they did register them at the time and immediately sent me brand new eyecups. You will hear excellent things about the service.
What I might do is take you friend up on his offer with the caveat that you verify thay you can register and use the warranty. You take them, call the service center and get them sent in for a servicing, if they accept them with no problems you pay the friend.