Well... It was days I was struggling with myself about doing it, and now I bought it!
First of all, I must say that it's really a very good lens, I love the bokeh and it's also very very sharp.
But what surprise me was how fast it lock on with auto focus! and also how nice is
for portraits too, at f2.8 the depth of field is shallow enough to blur your nose and your ears
If you want to look for your self: oha.it/macro
and some more: oha.it/reptilpark