I was eyeing the Sigma 150mm Macro thing, but I think this lens with a Kenko 1.4TC might be a better option at 500 dollars as opposed to over a grand for the Sigma. Besides this is seriously going to be eating into my 150-600mm lens fund as it is.
Not very often,i keep using age as my excuse but i honestly struggle getting down and close while still maintaining a steady hand,the 105 is a 10 year old one with no VR,i keep being tempted with this oldy which was great in its time,just not sure how it rates now.