Pros : I love the glassline pens. They are so easy to use. This white is a "creamy" white color, which I like instead of bright white like liquid paper. I have fired this at different temps and really like the results. At approx 1400 (for me) it leaves a bit of a rough surface if placed on top of the glass. I like that effect, but if you want it smooth, I would suggest a Full Fuse.
Cons : Be sure to shake VERY WELL, otherwise you may have separation. I always squeeze some out on paper before applying to my work. First squeeze may be a bit watery.
Other Thoughts : Make sure to get the glassline pen tips. They are assorted sizes. Otherwise the opening on the pen is a medium-thick line. You can get much finer detail with the tips.