I had David B. come to do my audit. He was very professional and inspected both outside and inside of the house and was very thorough. Main problems were air leaks, especially potlights and fireplace. He did a blower door test and walked around with me to show where the air leaks were. He made suggestions as to where the leaks from the potlights on the ground floor may have been from, since my 37 yr old home had double layer brick walls but most likely uninsulated. Also my roof needed more insulation and proper weatherstripping of the hatch. He wasn't as useful about the fireplace as it wasn't his specialty (which I found another company to fix).
I had no problem getting back my first rebate quickly, and David emailed me his detailed analysis report and replied to my email questions even a few months after the audit. The report was a little confusing though, especially about the part about my basement insulation. But it was nice that it prioritizes which upgrades gives the biggest rebate for the dollar spent (mine would be to upgrade furnace, followed by adding roof insulation).
They do have a separate person who takes care of the reno job as well, but after his estimate I decided to go with another company mostly due to price. The estimate itself was useful in that he detected more problems that David didn't (including pot lights on the top floor that were non IC rated).
If you do go with this company, my advice is to ask for David to do your audit, followed by an estimate with their renovations team to make sure no other problems exist.