Pros : The nice thing about dicro slide is that un-like etching or removing dicro coating from glass to make shapes stand out, there is no dicro wasted.
I've regularly used shaped punches (like hole punches) to make fun shapes or patterns and then used the left over bits from around the punched out shapes to make confetti Some of the negative space shapes are more fun than the punched ones ;) Best part is being able to combine multi colors of dicro in one project.
Other Bonuses: It's easier to carry with me between home and shop, I can put it on any color glass I want (on white frequently works well)
Cons : The dicro can sometimes come off the film, I've had it both left on the paper, and come off in the water. If the slide is older or even stored imperfectly, this is much more common.
Some colors are more sensitive to over-firing/re-firing than others and while some colors are just as brilliant as regular coated glass dicro, others seem to be less intense, and more see thru. Slide often doesn't work well capped to start with, so I've tried tack firing it on, then capping to do my full fuse but sometimes the image distorts doing that.
Other Thoughts : I wish the squares were longer, I get they use small samples so you can see the color, but I like using it as edging,and this makes for more cutting and piecing.