Hi Calum
I have met with this guy you speak of twice on viewings.  He also offered me the same deal - 500 euro for a personalised service. Basically, he said that this would allow him more time to personally photograph any properties he thought would be suitable for us.  However, his website does contain many pictures of properties and we felt that this was not worth the money, as we would still need to view any potential properties he matched with us.  Also, most of the properties he has for sale are in need of major work - not good if you're looking for something to live in straight away. you can PM me for more details if you like.
Haze