APO Product Options, Variants

BEWARE. We've used this app for 5 years. They recently updated the app as the older app was having issues where customer's weren't getting charged for options even though they showed on the order. The new approach resolves that, but it opens up some serious issues:
1. Products with options can't have their inventory tracked. This was not told to us when we migrated. It is in "development" (and has been for a while), but it is absurd they launched an app that doesn't have one of the primary functions of e-commerce - tracking inventory. That means you have to manually update your inventory for these SKUs. Really?
2. The new approach can cause a host of other issues with functionality with other apps as it created new custom options variants or SKUs for every order. We had to revamp all of our shipping software to try to accommodate this new approach (with limited success). We also ended up having to remove options from some products because it become too complicated to manage.
3. You'll get a a lot of extra variants or SKUs in your admin system that are a pain to manage as anytime a customer creates an option on your site, it generates a variant or SKU in the back end.
If you don't care about inventory tracking or compatibility with other apps, it works great. Otherwise, BEWARE of using the app.