I have fed SS in the past, but the cost of having it delivered and the need to soak well in advance was too difficult for me now that I only have 2 ponies.
I feed Speedibeet - with seaweed, rosehip, magnesium, yea-sacc and cinnamon added (which I get from Natural Horse Supplies - they are on Ebay). Just 3 handfuls of Speedibeet in one evening meal. Frayne is kept in most of the time (on a cattle shed/yard combination - concrete flooring) - weighed out hay (about 3 slices per day) and bedded on barley straw, which she does eat. She may go out for 2-3 hours on an old stone track with grass along the sides - but wears her muzzle, and it is not every day.
There is a Himilayan Crystal Salt lick hanging in their shed, which is very popular.
The only treats she has are the Linseed ones from Natural Horse Supplies, or a bit of carrot when loading her.
As much exercise as I can give her. She will happily do a 2-3 hour ride now without her boots (our trimmer says she has rock hard feet and it is obvious how much roadwork she is doing). I will lunge her if I cannot ride. A magazine article this week says that 1-2 hour brisk walking per day is the minimum for Lami-Prone types. I cannot ride every day due to my health, but when I do this will be our minimum ride. Otherwise, 15 minute minimum of lunging or Parelli games (where I will get her breathing hard and slight sweat) is a fun way of getting her moving.
After 3 years of experimenting this is the best system for her. She is the lightest she has ever been, full of energy, wonderful shiny coat and amazing hooves. She is hardly footy at all (always the first sign that all is not right) and it is an easy system to maintain.
I have fed Blue Chip Lamilight etc, but read about avoiding any cereals/alfalfa. Speedibeet with the few powders mixed in is cheap and easy.
Ali xx