My bunch flat refuse to eat alfalfa cubes, but they will chow down on alfalfa pellets - and they don't have to be soaked.
I second the Nutrena Life Design Prime. It's expensive to buy, but not to use, because you don't have to use nearly as much.
We had our skinny bunch (long story) on Nutrena Life Design Compete to help them gain weight. Once they were at a decent weight (didn't take them long) we switched them to the Prime.
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!