This lens has been around for over 25(!) years and is still one of the best macrolenses on the market today. For me the best part is the quality combined with the range. It starts at 1:1 and goes all the way up to 5:1 magnification. It allows me to always be flexible and not having to change my lens wether I want to shoot a bumblebee or a tiny jumping spider. Downsides? It’s completely manual, plus with 710 grams (25oz) its pretty heavy.
As of 14 November 2022, this lens is officially discontinued. It will still be able to get it second-hand, but getting it fixed/serviced will be tough.