Simplify: Bulk Price Editor

EDIT to add:
I can not recommend this developer enough. He recognized my frustrations and went beyond what I would ever expect a developer to do to make things right.
A great developer, look forward to trying the app again in the future to see if my grievances have been worked on.
This app used to be quite good but it seems the developer has abandoned it. I've tried calling multiple times for support, left two voicemails but called nearly half a dozen times and never receive a phone call back. The app is buggy, and slow. If you create a product in shopify with variants, and later decide to re-do the product, (changing variant names, adding or removing variants, or deleting the entire product and creating a new one) and all of the old products and variants remain loaded into the app.

The app a year ago was spectacular. Now, not so much.