The experimental balance wheel in XB5.0 is probably either still under testing or is going to be shelved. Since it doesn't add a lot of value to most consumer's eyes, selling it nor marketing it doesn't add a lot of value. Consumers don't think much about servicing costs when they buy something. Kind of like when a consumer is deciding between a BMW 3 series and a Mercedes C Class, nobody even realizes that the BMW will cost about 20% more to insure in most areas.