Nice flexible rack... I have built several of them over the years. My last one I bought aluminum tubing (painted flat black) and made sleeves to go between the nuts to clean up the look a bit more.
Yep, anybody that has a halfway decent room, should see a big improvement in the image, going to the 5 or 6 series. This is why the 5 series has outsold the 4 series (with us) for the last three years.