Why would it be a bad idea to replace the old version of that HW with a new one? Well, every manufacturer who cares about their reputation and wants to keep their customers and attract new ones launches something new on the market from time to time. If you want more security, and if you're sure this device can give you that, I don't see why you shouldn't invest in it.

Maybe I misunderstood what the problem was, because there is no new version on the link you posted - which means you can't buy it for cash even if you want to?