I'm a little biased towards Tufos since I am the West Coast distributor; however, the sealant does work very well on small punctures from thorns, steel belt radial pieces and similar items. Large cuts will not seal up. Glass is our enemy in Southern California.
I sell the sealant for $3 for the small tube and $5 for the large tube. I usually carry half a tube with me and if I get a flat, it is my first choice. You don't have to remove the valve core and the tube is design to thread on to the valve body.
Tufo tires tend to work better with the sealant because they are "tubeless." Tubes in normal tires move independently from the casing and if something like a thorn remains in the tire, it will continue to tear away at the tube. With Tufos, I often leave the object in and many times the tire will not go flat even without the sealant. I often demonstrate this by sticking a safety pin in my tire. No air comes out even without the sealant.
aka Mr. Tufo
Del Mar CA