Anthology Puzzles review for PreOrder App+Partial Payment K

Impressive functionality for a free app and does exactly what I need. Customer service even provided a little customisation and did so within a few minutes of my request. It remains to be seen how the app performs on my store in the longer term but my initial impression is great. Note: Inventory quantity must be set to zero and "continue selling when out of stock" must be enabled for the app to function correctly.