I definitely recommend Sedona instead of Holosync. For me, I'd even pay much more for Sedona than to use Holosync for long term at a low cost.
I got holosync first and stopped using it after a few months. I didn't see any big effect but was concerned about the time (at least 1 hour a day) and possible side effect on my brain. 1 hour a day is a lot! I also decided to not to go to next level. Then I received a letter from the Holosync inventor Bill recommending Sedona. Thanks to Bill, I got to know Sedona. The Sedona method is very simple, natural and efficient. It can be applied any time, without interrupting the on-going activity. Also, with Sedona, one is Proactive instead of Passive. I cannot think of any possible brain damage using Sedona.
In short, Sedona is far superior.
