All seems a bit complicated and jiggly to me. What with full power, attitude changes, cruise power etc. Perhaps it's type dependent, but in C150/152/172 and the PA28s I stick to the P-A-T model. As I'm approaching the level I want I add power to cruise, raise the nose, and trim.
Are there many instances when a full glide descent to a specified level is necessary? PFLs involve bursts of power for engine warming, and glide approach to either land or touch and go. Otherwise the P-A-T model should be ample unless type/POH requires another method.