As a unit the band is somewhat reminiscent of the classic Ornette Coleman Quartet and Impulse!-era Archie Shepp, even though none of the individual players exactly resemble those artists. This is probably a result of the piano-less format. Yennior & Voelker do interact in manner similar to Don Cherry & Coleman at times, but the compositional structure is a bit tighter. They also play with a concision that one does not associate with the avant-garde; the median song length is just over five and a half minutes.
One thing I like about Gypsy Schaeffer is that they play with a sense of humor. "I Want to Go to Havana" has some Latin influence in the rhythm and it also shares a baseline with "Smoke on the Water," of all things. "Joisey Boys Shuffle" (everybody but Perez can ultimately be traced back to the Garden State) is like the aural version of a scene from a movie following drunken sailors from one neon bar sign to another. "De-Training" shows them to be adept at handling the blues.
It's no wonder Berklee and Boston have such stellar reputations. Look at the players they produce. Gypsy Schaeffer is a fine debut CD, adventurous but not rudderless. Yennior & Voelker are able and promising composers as well as players.