I'd say its better to have it by far. I vape a wide variety of juices (DIY, whatever Mrs T's are made of, Virgin Vaper pure VG, Deknag pure PG, etc) and there was always juice in my cup.
I am having the mod done, my metal guy modded the mod a bit and put some other kind of metal in there to make the whole thing very funnel-like and is now working on re-anodizing/painting/whatever it. He swears you can pour oatmeal in it now and it will go down the hole. I've been without my vapemate for almost 2 weeks now, hope its all worth the down time.
I've also asked him to install some kind of LED over the window so I can use it when its dark. He says he's not sure if he can find a compact way to do it. Do you have any suggestions forcedfuel50?