Total Immersion: Are the workshops worth it?

Hi, Have been a masters swimmer for about 5 years now. Was wondering if experienced masters swimmers (or even newer ones) have found any benefits in the 'total immersion' technique. Have watched several YouTube videos and read articles but was thinking the video evaluation and pool instruction included in the workshop might be helpful. Have noticed recently that my form/technique seem off and ineffective - was looking for some new insight and direction to help me with my efficiency. Thanks!