Other exhibitors can probably tell you more, but from what I saw representing WHT last year, the exhibit hall was a success for most exhibitors. Other exhibitors I talked to were enthusiastic about the interest in their services or products. They said that they'd gotten a lot of leads. They also said, though, that they wouldn't really know how successful the event had been for them until they'd followed up on all those leads afterwards.
Only one exhibitor told me that he wasn't getting the expected results. I don't remember who that was except that his service or product wasn't as targeted for the industry as most others were.
It's possible that people responded positively to me about their success to avoid looking bad. But since I wasn't representing a competitor and wasn't a potential client, I think they were probably sharing their real experiences.
If you exhibit at HostingCon, be prepared for a lot of people coming through on the first day. That day was really busy. The second day still had fairly good traffic, and the third day not that much. But the exhibit hall hours might be different this year to spread the traffic out more.