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I think Draytek products are massively overpriced and only worth it if you absolutely need it to perform those functions in a "supported" and "out of the box" manner.

What you're asking for can be done for free in software, both running on a computer or a router. In fact, it can be achieved on a £10 router with free software. However it does require some more time to set up, though still not more than half an hour to an hour, even for an inexperienced user.

Course, if you have the money, and need for it to "just work" then the Drayteks do really have a ton of good features. But if you're willing to "muck in" and do it yourself, the same can be achieved for less than 1/5th the cost.