I do have this DVD, and I learned quite a bit. I am very new to chocolate, though, so I may not be the best judge of "informative" LOL. I also have Ewald Notter's chocolate decorations, and the two show different approaches and techniques. They were both worthwhile investments for me 
Probably as detailed, just slightly different techniques and approaches. Costello covers basics, gives some recipes, and shows a lot of detail just like Notter, but there are some different aspects covered by the two artists along with presentation of individual applications. I like seeing how different people accomplish similar results. There are no obvious conflicts of information or instruction - just individual variations and some different applications.
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