I use shreds, soaked briefly in boiling water (as long as it takes me to walk to the goat shed) and they love it. Especially if it is still warm in winter, but they aren't fussed about it - love it hot or cold. I have never used any other sugar beet product, mainly because when I started with shreds they were cheapest and don't need hours of soaking...
I also feed it to my female sheep in winter, mixed with a few oats. Can also be fed dry if ample drinking water is available.
The jury is out if it is dangerous for boys (as in urinary calculii), but my goats have a splash of cider vinegar in their drinking water, so that should sort any problem anyway.