Hi Alis,
If I remember correctly, the reasoning behind reversing the lens was, that normal lenses are calculated for when the image is closer to the lens than the subject. In macro larger than 1:1, you find yourself with the subject closer to the lens than the image (film/sensor), so reversing the lens should get you better quality.
In film days, such macro work often involved bellows (which often implied NO aperture transmission anymore...), manual focussing etc., so lots of fussing anyway (been there...), reversing the lens wasn't adding any fuss in practice.
If you do it nowadays with an AF camera, you'll still lose
all automation. And the macro effect might just be due to moving the lens away of the camera. Personally, I wouldn't bother with reversing the lens, and invest in (a set of ) extension tubes, that let me keep the automation, including autofocus (as long as there's enough light...).
This might interest you as well. I noted especially his remark about exposing all the couplings when reversing a lens...
Remco
(Would someone know how to connect my Sony alpha to a Contax/Yashica bellows, by the way?)