Very little wine is actually "wasted". Far less than what you would waste if using carboys. Especially with this guide, since he only has to empty the collection ball once.
I just picked up my second Fastferment and have made 4 batches of fruit based wine in them without any problems. I have used this article as a guide to my fruit wines. Fermentation times are unpredictable, so you can't make a step by step guide for every type of wine. I have a watermelon...