Had my now 18 year old on this for the past two winters. He really likes it but last winter I struggled to keep the weight on him, he went a bit ribby and i was pumping feed into him.
For that reason i'm thinking of feeding him on straights this year (plus cheaper, 16+ has gone up to over £10 a bag from £8 last winter) as he's very easy going and although I think it is an excellent quality feed I didn't think that the joint supps etc did much for him.
I might try Allen and Page old faithfull first though as i'm a big fan of their feeds.