The barn I just moved my mare to feeds Strategy to most of the horses and they all look wonderful on it. My mare just made the switch from a sweet feed (the barn grain at the old barn) to Strategy and she has mellowed out from it (plus extra turnout at the new barn). It is a small barn so she does not get in bulk, but will buy a palate at a time so the boarders can buy it from her for cheaper than at the feed store (buy $15/a bag rather than $17.50 at the feed store) and your own grain is kept separate of other people's. Some horses are on different things (Relieve and Senior) and then the owners just provide that and are not paying for barn grain that they are not using.
My gelding is on Safe Choice at his barn that he's staying at for the summer (Nutrena) and he does better with a higher fat when he's working, so instead of upping his grain, I use Empower Boost as a supplement to his Safe Choice, rather than upping his grain (he only needs a cup of Empower twice a day).
Both my horses are fairly easy keepers, my mare only gets 1lb of the strategy twice a day along with her Quiessence and SmartFlex Senior, the boy gets about 3lbs of SC twice a day, with his Empower. Both horses are in good weight, and all the horses at their respective barns look excellent.