The 70-300mm is a great lens: is soft and no very crisp, try to use above f8 and for macro shoot is a good alternative. You can see some example at
http://marceloanelli.com/fotomac/?p=462 and
http://marceloanelli.com/fotomac/?p=423.
Is a handy lens that work well with any E-Serie Olympus camera, I use with E-410, E-510 and E-30