I've had 4 years, but did very little used.
I mostly use its big brother, the model "Michael Brecker" hand. Obviously this is Guardala ... I play with "Lavoz Medium". It's easy to issue despite a significant opening of the power and a recognizable timbre.
I especially appreciate its ease of playing harmonics or subtones, power face amplified instruments, flexibility to play with finesse.
The difficulty has been to move from NY Otto Link metal Guardala for its decision in the mouth (finer).
adaptation will be less easy to hard rubber Guardala.
Its price is reasonable and if it was necessary I would do this choice.