I've worked with Paul Hillier a number of times and always found him to be highly professional and very congenial.
Most recently I needed professional head shots for my new corporate website. Normally I'm not very photogenic, however Paul was really able to capture some amazing shots that I'll be able to use.
Paul has a warm and very easy going way about him, making you feel comfortable and more relaxed. He really knows how to get you to smile!
I've seen Paul working a number of events around Toronto, including Yelp, and he was always eager to take our picture.
In regards to Chris P's negative review about Paul, I also attended the Elite event at Reposado. The event was incredibly packed and it must have been very difficult to find room to take pictures. There were also a lot of drunk and belligerent people, completely smashed on tequila. While I didn't experience anything like Chris P has mentioned, I supposed it might be possible in an environment full of completely wasted Yelpers.