@TennisManiac I don't know what these numbers mean exactly, I think they are (mostly?) used in NA or USA, but I can hit and hold the ball easily with a pro player, and have hit and played with ex pros, aspiring pros, and hit a lot with advanced 16+ juniors etc. An actual active pro would of course destroy me in serious match play, primarily because when you include serves and returns, you really have to be "in the game" non stop to handle that consistently. Then there's age, I'm 40+ now, so slightly slower, and of blurrier focus sometimes etc.
But nevermind that, I'd easily just write that instability in Speed Pro 360+ is just my observation/opinion but actually no, both JP from team-tennis.fr, and Michelle here in the TW review noticed flutter and instability on the Speed Pro 360+ hoop, and I didn't when I demoed it, so I bought it. Well, then I sure did notice it, with or without lead. For coach-like hitting it's great, but as soon as I started hitting harder it would just shake. On serves same thing, placing them was OK, but as soon as I tried to serve normally with full speed it would just flutter. But a nice racquet otherwise, although even without that I lacked some attacking power with it, it is a consistency kind of frame, not so much for power play. When I did hard court hitting sessions with really good players last winter, I easily noticed how I can hold crosses super consistently, trajectory and all, but I can't really hit a faster ball and punch through although I already had lead on it.
New Speeds should be arriving in a month or so, and I am sure Head did their homework, because it seems that people speak of new Auxetic Prestiges as if they were just tuned 360+ Prestiges, so if that will happen with the Speeds - great.