I've found that the 8.5 by 11 size provides an esthetically pleasing rectangular shape. However the profile is somewhat obscure. During a taste test I found the approach critical as a horizontal feed resulted in numerous paper cuts.
I frequently print documents for my 2 1/2 year old for homeschooling and since we ran out of paper and this was a steal after the easy rebate I bought two reams. I think it's a really great product.