We don’t know enough about this product yet to have a real idea of its value – if you can actually generate a 4% return through spend and referrals that’s going to be really strong, but most people won’t be able to successfully refer someone every month.
Referrals aside then we’re talking about 2% back on the first $15,000 of spend each year. This card is only interesting for spend above $15,000 to get to 3% back. But you’re going to have to spend substantially more than $15,000 on the card before you’re really getting enough value to make the higher rate of return worthwhile.