I experienced the limitations of the slayer, during a tournament on the week end. 49 hobies and me and I was passed by the entire field on both days before we got out of the bay. The tournament area had a heap of free floating ribbon style weed, which when wrapped around the propel, made the yak feel like it was towing the queen mary.
It was pointless clearing the propel as it would weed up as soon as you started again, I'm not talking about a lot of weed either just a few strands, but the impact on the propel was substantial.
I think as a community we can all come up with a solution for this.