fdd's look waay better and thicker than those dagga ones. it explains how thick and durable they are but look super thin. the bowl push looks like its super thin.
Did you only look at them online or have you looked at them in person, held them and smoked out of them? They are anything but thin and they are tough as nails when it comes to most other glass. Once I found them I got rid of all the other glass I had other than my Roor products. The rest did not begin to compare.
Additional:
Dagga's advertisement says ...
Specializing in a line of inexpensive yet EXTREMELY DURABLE flameworked glass color changing hand-pipes. My double layer spoons are just that, two layers of boro-silicate worked together and annealed (kiln tempered) properly. They can be dropped, many times, on concrete or ceramic tile and they won't break. They are not completely unbreakable, but very close.
I can attest to that. A couple of mine have been dropped repeatedly on hardwood floors and once on a quarry tile floor, though admittedly from a sitting height, and so far there hasn't been so much as a chip let alone a crack or total break. They are not thin and they are not weak.
But everyone has to decide for themselves what is a value in their own mind. Quality alone will not always be enough for someone to decide because perception overrides all else.