Since I couldnt see crap out of the stockers it was a no brainer for me.....don't see behind me or get bar-ends and have the ability to see behind me.
However to answer your question You can still see most all things behind you with the bar end mirrors. It depends on how you have them adjusted tho
In order to see behind you directly you will have to include a little of the bike so you lose some mirror view of what could be right over your shoulder ont he road...
Just get em, they are worth it....oh and I have the Lansesplitters...well worth it for parking, garage mobility and well.... lane splitting