As with many other brands, a DLE is just as good as the person using it. If the owner doesn't have a clue about engine set up then they will have problems. The same problems they would have with any other brand, including Zenoah. You read about them in here every day, especially Zenoah. The number of posts from people that can't get their Zenoah started is amazing. To a man it's because they didn't read the instructions on prop positioning.