Can you validate these assumptions I made about FBA?

....FBA's pricing structure can be complicated and hard to understand. FBA charges a per order transaction fee, a per unit shipped fee and a handling charge based on weight. Additionally FBA charges storage based on cubic meters and their storage prices go way up during the Christmas season. When you are fighting for list results against a horde of similar priced products, not having a firm grasp of your fulfillment costs will either cause you to price yourself out of the market or lose money on every order. Our easy to understand Flat Rate per order model makes your fulfillment costs simple to understand and is guaranteed to save you money.
One of the biggest risks with fulfilling your products on FBA is commingling. What many online retailers do not understand is that when you ship your product to FBA, unless you provide a pre-printed Amazon label on every unit you send, your product gets added to a massive pool of similarly described product. Let's say you list a nutritional supplement and ship your product to the nearest FBA in Texas. If someone in Florida buys from you, Amazon checks the UPC code and finds somebody else's product located in a Florida FBA facility and ships their product instead. You still get the sale and the customer saves a day in shipping except when the customer receives the package he might find the product is past it's expiry date, or the labelling is different from your listing or, in a worst-case scenario, the product is counterfeit.
You have absolutely no control over FBA's supply chain and your online reputation can be damaged by unfair seller reviews or customer complaints. The only way to avoid this is to print Amazon's proprietary labels on every single unit you ship to FBA which can be very man-power and cost prohibitive. With us, you always have 100% inventory control and your products will never be mixed with other clients.