We have eaten lunch there but not dinner. I think the only difference is that they have prime rib at dinner and the price is seven dollars higher. Since DH and I are vegetarians, we opt for a late lunch instead. We loved the food both times we ate there and I can't wait to go back. It's similar to Boma in terms of the unusual items on the buffet and the spices used in the food. DH particularly enjoys the little samosas. I like the spiced tandoori tofu and the curried rice among many other things. We love Indian food and the Tusker House buffet is about as close as you are going to get to Indian food at WDW. Here is the menu: http://www.allearsnet.com/menu/menu_tus.htm
DW and I and a friend of ours had dinner there last week. It was super lots to chose from. Prime rib, chicken, and lots of other great foods. They had a apple cherry cobbler that was great.We will be doing them again on our next vist to WDW.