We got a good deal on our symmetrical for our P40. In the PNW, there is a lot of dead downwind sailing heading north and south between the islands and Seattle. So we are really happy to have good downwind performance. In light winds, it does not matter how big your genoa is; the cloth is typically too heavy to fill. If you want to turn a really boring motor into a fun sail, a spinnaker is a great way to do it. Note the sail is only part of the cost. You will need sheets, potentially guys, a pole, blocks, and more. I laughed when we got our $400 spinnaker but then spent twice that on rigging. I can certainly see advantages of an asym, but I also see advantages of the symmetrical. I think it's one of those things where you can spend all day debating and not do anything, so I decided to just go the cheap/easy route and sail!