There are previous discussions on this—use search. I tried one and a) it sounds like a recorder and b) it relies primarily on overblowing for octaves (like a recorder). As a long-time recorder player in early music groups who didn't yet play flute, I gave it a try, and rejected it and decided to go for the real deal and develop an actual flute embouchure on the flute headjoint. Depending on your goals, perhaps the Fliphead is worth a try, but it's quite different from real flute.
It is, politely, a hack. The beauty of the flute is the ability to change the embouchure. I won't go into the physics unless somebody wants to hear it, but for optimum control and timbre, one should control the shape of the embouchure that produces the air jet, but more importantly, the distance from the lips to the embouchure hole striking edge, which allows control of tone color, intonation and dynamics in the second and third registers. A fipple head has a fixed air jet and distance, limiting all these parameters. This is exactly why the recorder lost out to the flute, just as the harpsichord lost out to the piano. In addition, not having a space above the embouchure hole, as the transverse flute does, means that the third octave will play way sharp. Much better to learn to play the flute correctly.
I recently played a Renaissance concert on tenor recorder. Besides the lack of rehearsals, arrangements etc. the instrument is hard to play. Even with large hands. Especially in keys far from C or with numerous accidentals.
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