The Web App is great so far, I can dearly recommend it.
However, some small improvements are needed:

* "Detailed summary" in Pick list summary does not provide a "print by default" option, which sucks.

* Sometimes the list shows product names even though I have selected to only show SKU values and they are assigned to the product. It is switching back and forth between SKU and product names.

* iOS/Android App is missing!!!
Having to login via Shopify Web App is not very convenient on a tablet.

Still, this is a really great app. I hope you will improve quickly on these slight inconveniences ... especially the smartphone App and the pick list summary.