Both mine do well on the pony cubes although I do move to a feed with higher energy content when they are in harder work.
All the products seem to be good value for money the chap there says they're supplied by Baileys and so should be reasonable quality. I suppose it depends on what you want to do with your horse, its temperament, breed etc as to whether you decide to feed it. But for the bog standard horse in light/ medium work it all seems good and will probably save you a few ££ too!
i feed the slobber mash and a bit of alfa oil. a couple of them have the sports mix too. they all love it, keeps condition on without making tham any sharper also the slobber mash is fab for anything thats at all prone to colic. and they love the cookies!!! even spottie who doesnt do polos!!