Oh yeah, I meant to mention... that's one of the things I like in a bubbler and even a tube. The last piece I got, the M&M Tech... while I like it... it bugs the horse@#$% out of me, that I can't watch my hit. Especially if I'm wearing a white shirt. LOL!. I've got to be standing in front of a mirror and I watch for either a logo on my shirt or my hand.
That's one of the reasons I liked the old Mobius style so much, with that big rounded top, its the perfect viewing space. My Lattice is a blast to watch, however its a different angle and while it does have a smoothed edge, its still a 90 degree bend. But, the DR with the rounded top, very reminiscent of the old Mobius (though much smaller tubing). I like the way vapor rolls off a rounded top. You can see it in my old MFLB/Saxo video to. Which is close to the Mobius profile, because of the size. Speaking of which, Black Leaf so screwed that piece up. Had they just gone with smaller diameter MP, that thing would have hit with the best, best of them. Would still be a Black Leaf, but it is one amazing perc. Poorly designed. Still amazes me.
But, so much funner, when you get to watch it, what's going on. I'm going to be seriously cross-eyed in 5 years, but who gives a @#$%!?
I could see a Mobius being a bit harder to see, with the T series and the smaller Ion, because of the nature of the perc. Since it is dragless... you're not even really seeing the little puffs of vapor, as they fill in the chamber. Not something I'd ever complain about, in a review, or in function... I just get what you're saying about (not) getting to see it.