Because the B260 (526TID-HDD) has multi-elements on the LF side and both are tuned to the freqs they are working at, it is unlikely Rezboost would offer you much. Rezboost is about post processing target separation for C/W transducers. Because of the multi-elements it will not make as much of a difference compared to a transducer that only has a common element like the B60 or V744V. If that is the focus and the other items about the newer units are not important, some money can be saved by getting the TZT3 and having the feature. Do I think you will see much of a difference using that transducer? No