I am 6" soft and my balls used to hang just as low. I would not call it heavy but i could feel the swing of them to my legs when walking around naked, it is a strange and fun feeling, never quite finished to get used to it. Underwear is a total pain in the balls until you find the right ones I wear 2xist and it's working out well so far.
Being large soft has been a troublewhen trying to conceal a bulge in situations you don't want to, like family reunions or at work. Girls I've been with have not cared much about it, they've made comments but are pretty careless about it.
There was this pub that had a big common urinari with a big mirror in front so you could actually see everbody doing their business, and i remember going there once and pulling it out and being so much longer than the rest
, it was a really fun feeling
Having saggy balls has been by far more problematic and painfule due sitting on them and having them sink in the toilet and when the underwear is too tight they are the first ones to notice or to slip out through the leg elastic which can be quite painful. My balls are not very big but they can sag.