We did the Freedom in Sept. and have two boys with us one 25 and the other 23 - who loved the FlowRider. The absolute BEST BEST advice I can give...wear your swimsuits on boarding day and get the kids to do the FlowRider then. That's what we did...everyone is too busy boarding and familiarizing themselves with the boat. The FlowRider is open boarding day and our two boys were on there for a solid half hour - solely the two of them...at which point we forced them to leave (to go eat of course!)
Any other day...be prepared to wait. What's frustrating is your first few goes you will likely fall off the board, and once you fall of your board - you're turn is up - back to the line. And it does take a few goes to get the hang of it. So be prepared to wait.