Yep, more so to add reliability at distance.
Spent a fair amount of time (2-3 wks) doing nothing but letting her wear it and finding the lowest possible working level (about 16-17 on the dogtra, I tested it and couldnt even feel it till it got to 19-20) Recall was 100% within 3 sesssions and it meant at christmas she could go for a swim off leash at the river, with me still being confident I could call her back if a ski boat was coming near.
Having spent two years trying alternatives but still having limited sucess around moving objects at distance and she is so fast there is never a large margin for error, I am comfortable it was a good investment.
(the manual from Steve has some nice straight forward instructions that were very effective)