I've seen a lot of new frames with a Deadcat style because it keeps the props out of view for cinematic videos and such. Does the Deadcat shape of frame have any effects on flight performance?
I personally have never used a Deadcat frame, but I found this forum thread asking a similar question, the answer is:
I was more interested in how the dynamics of a dead cat might affect efficiency. But based on what some of the long-range guys have found, it doesn't appear to be an issue. One thing that did come up with the SG+ at its genesis was instability while in steep dives, like down cliff faces, etc. Guys were setting up in BF as a straight X design. Once they started setting up as a custom in BF and used the program that Project Blue Falcon explains, the instability went away.