I make huge use of the forward and back buttons on my Logitech G500s at work, and the dual-mode scroll wheel is immensely useful in Excel. Plus I'm significantly more accurate with it than a normal cheapo mouse, which has a noticeable boon on productivity. Mouses and keyboards are like SSDs and HDDs; if you're used to the better one you'll notice how awful the worse one is, but until you use the better one the worse one seems just fine.