OPTIS Product Options, Variant

I absolutely love the way this app is organized. I save so much time by duplicating options instead of re-doing every item page like I used to. The support has also been wonderful and they always answer quickly and solve my problems. The only downside is that I can't keep track of stock if using their options to show my customers different colours/styles. But that is a Shopify issue, and not up to the app developers. Really hope shopify deals with that soon!