I do find this add-on useful because it runs daily, in the background clearing out old, never used accounts usually associated with spammers trying to get around age limits on accounts, and I don't have to remember to do it.
I love a good addon just as well as any man. But the entire business of deleting accounts is 1000% better and easier via the Batch Update Users built into Xenforo 2. This addon is unnecessary. Nothing against AndyB, I use his other addons and they're great, this one just isn't necessary.