I suggest you avoid buying the Vector 3. You'll just end up like the rest of us who have a thousand dollars in a product that is still unusable. Hopefully the new battery doors will fix the issue but we still don't even know when we will get them.
People have started to receive the new doors so I guess new stock out of Garmin will have them fitted. If you need doors for an existing pait of Vector3s then speak to Garmin support.