The 7.8's have been working great for me. At Phoenix, Jim Allen and Dave Shadel had both tried them and said they felt they were faster than the 8.0, so I bolted one on Friday morning, flew one test flight, it seemed fast, so I went to the NHRA drag races. Other than a few heats at a Basin race where I played with a couple wood props, I've only been running the 7.8.