Redex Diesel Cleaner at BMS Automotive – Any Long-Term Benefits?

Hi all,
I recently had a diesel injector clean at BMS Automotive, and they used redex diesel fuel system cleaner as part of the service. Initially, the engine felt a bit smoother and cold starts improved, but I’m wondering if anyone here has seen long-term benefits from using Redex through BMS or on their own. Do repeat treatments help maintain injector health or boost MPG over time? Would love to hear your thoughts or comparisons if you've tried other cleaners too.