This is by far my most used lens. Tacksharp and reliable. The lens extends compared to it's successor so something to look out for when adding teleconverters (TC's) and diopters. I've added various TC's and diopters to this lens and that's what I love about it. It keep performing delivering solid sharp images whatever you screw onto it. The lens is built like an iron tank and quite heavy. Slower in AF I can imagine than more modern lenses, but it hardly ever hunts. It just hits the sharp spot time after time. My lens has survived a makeshift glueing and sand from Morocco, but I still use it weekly after those ordeals after some 3 years of diving. In temperate waters with limited visibility this is the lens of choice, because I need to get to close to my subjects anyhow. Focusing distance is around 8cm or 2,5 inches delivering huge rhinopores of nudibranch for instance. The 60mm feels like a trusted friend. I simply love it. The best lens in my arsenal and easy to work with.
Well mine is almost 20 years old, I bought it when it replaced the old manual focus 55mm micro back in 1990 and its seen an estimated 50,000 frames put through it. Its a general work horse lens for close-up work but also general topside stuff and studio product pix as well. Also not bad as a quick portarit lens if you want more depth of field than say the 105mm. Mine has had its fair share of salt water spray over it and still carries on - I fear the new af-s version may not be as robust?
Easily the best choice for macro photography. You must be capable of approaching subjects closely but the lack of water between the lens and subject, coupled with the depth of field possible make this the lens you are most likely to capture your best macro images with. In a pinch, you can also get medium sized ( up to maybe a foot long) subjects