Basically what others have said is true in the description of the bowls and what they do. I prefer smokng from a Tangier's phunnel most of the time. But you can get the same qualtiy smoke out of a regular deep clay/ceramic bowl as long as you pack it right. In my opinion, one should always practice on stock bowls first and get that skill down first before moving on to a phunnel...but like I said, that's my opinion...
And for those of you who think that a scalli glass mod is "worthless" or "useless", think again cause you're dead wrong. I've found that mod to be very helpful in preventing the foil from being sucked down. And don't tell me to stretch the foil tight, cause I've been there done that and it still got sucked down. I also poked a big hole in the center like you're "supposed" to and that didn't help either.
So it's not a placebo effect at all. It's actually helpful and functional. Also, it keeps the coals from moving closer to each other and staying constantly together in the center. Once again, don't say that it's because you have to strecth the foil tight, because trust me it couldn't have been tighter. And yet, the colas (because of their weight) still saged down towards the center every few puffs.
Obviously this was annoying because I had to keep on seperating them every few hits. The mod is very useful at preventing all this, and I recommend it to anyone considering the purchase of a phunnel.