The feed back I had before plumping for ontrack was it wasn't as dry as AOPA.
On the day they had the usual suspects about from on track and a few others, the dry as hell subjects were mixed in with some good presentations from industry type people including a presentation from a mil Doctor about aviation medicine and what they were looking for in the medical which was quite amusing and informative.
Also the group discussions were relevant and entertaining.
I think its mostly some thought about the content and how the intermix it, and also the delivery of it.
It is quite widely reported that by the first day lunch some are sticking pens up there nose and saying wibble at the AOPA seminar due to having spent the last 4 hours listening about licensing regs. The will to live was lost after 30mins when they started talking about SLMG and other such gliding things.