> I can see myself becoming reliant on this right before they sell out to Garmin or whoever and tell all their customers to FOAD again. Trust is very hard to win back.

This product is perfect for that case, though: you have to decide to buy another one each time the battery runs down, which aligns seller incentives with the user/purchaser. The danger cases are mainly when the seller gets up front money and then has to provide something indefinitely.