I had a Sigma 70-300mm and decided it was too heavy so I sent it back...then I decided I liked it and ordered another...the other arrived is not as sharp as the one I sent back....
Soooo.....I am send that back too! I will just get the Nikon VR and have done with it, it costs more than twice as much as the Sigma but, oh well.
I recently tried out 3 P&S cameras and sent them all back too.....I never said I was sane did I?