If you like the way they ski and the bindings are in good condition, go for it if the price is right. The negative that I see with demo bindings in general is that they have more moving parts for the adjustment feature, which means more possible things to wear out or break. If they haven't been abused and don't have a lot of wear, (and are installed properly) this shouldn't be a problem. After all, these bindings are designed to be safe for people who are renting or demoing skis. The negative that I see with the SpeedPoint in particular is that its mounting plate can modify the performance of the ski by stiffening the middle of the ski. You'll notice this more on softer and shorter skis. If you've already skied them this way and you like the way they ski then this is not an issue.