Amazon MCF: US Fulfillment

I have been using the app for about 2 months in order to have all of my Shopify orders fulfilled by Amazon. The connection of SKUs was simple and once connected, it seems to be robust. I am in contact with direct Amazon support for technical issues and they are working on fixing any issues I come across, which seem to be minor.
I give it 4 stars at the moment mainly due to the customer support for logistics issues when an order arrives late or never shows up or other issues related to getting the product to the customer. When we come across these issues and have to contact Amazon support for refunds, it is way too much back and forth with overseas support when it should be much more streamlined if issues need to be resolved. If a customer states that an item never arrived, we should be able to get a full refund for the cost of the product and the associated fees for MCF, or Amazon should send out a replacement to the customer at no charge and refund us the cost of the product. This should not take a dozen back and forth emails to do so. Also, if a customer pays for expedited shipping but arrives a week late and the customer wants a refund for their shipping, it should be easier for us to request a refund from Amazon as we do not want to eat the cost due to Amazons fault. I hope that they provide better support for MCF customers soon.

I can say this as an OG to the MCF app - I've been using MCF for our Shopify site for many years now starting with their older app, and the recent changes in the new app have been amazing! It runs very smooth, I've never had any issues when it comes to the inventory management and syncing products but in this newest version they have reduced a lot of the day to day workload in having to manually select shipping speeds per order which was always something cumbersome in previous iterations (and its entirely possible I was using these wrong then, but its set up automatically this time around). Once you set it up, it will map shipping speeds automatically to the customer's order and pushes the order with the correct shipping speed noted. Amazon's support has been amazing too, we wondered if we were able to automatically fulfill each other without having to confirm it each time - and they helped us out in a matter of seconds which saves us hours each week! (for those wondering, its a setting under your Shopify Settings: Settings/Checkout/Order Processing/Automatically fulfill the order‘s line items = yes)

Will be using MCF for many more years to come!

This app is relatively bare bones but is quick and works well.
Ideally I would like to see the following updates or improvements.

1. Ability to change MCF shipping speed after the order has been placed by our customer before it is submitted for fulfillment. If the MCF shipping speed was displayed the same way it is on customer checkout that would be great.

2. Display the cost of the MCF shipment in the Shopify order

3. Display the expected ship date and delivery date in the Shopify order

Not as easy to set up as other connectors, but Amazon was very helpful and made sure it worked. Orders are feeding through and so far so good.

If we compare this to TikTok, Amazon is a winner. TikTok is a loser.

In due time it should work really well.

There is a problem that the program cannot capture the quantity, and I can't solve it after looking for Amazon customer service. So I found the developer's email directly in the app. They dealt with my issue almost immediately, and thanks to their efforts, my sku has been able to recrawl the exact amount. At the same time, I also hope that the developer can fix this bug as soon as possible, which should not have happened. come on!