Can't be of much help on this one really. I was in touch with Seamus before our wedding but ended up booking another celebrant. When I emailed to explain we wouldn't be booking never heard from him again. I also tried for feedback but couldn't find anyone who had been to one of his ceremonies. It might be worth meeting with him before booking.
We went with Bill Chase. Lovely man and really easy going. No problems. My sister got Denis Hobson who was excellent and also a pleasure to deal with.
The couple puts the ceremony together so I think the most important thing is that you get on well with the celebrant!