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To two different ISPs? No, it will not be the same as a single 3 Mbps link. You'll get some bandwidth benefit but, again, the aggregate bandwidth won't behave the same as single link of similar bandwidth.
However, you'll get the benefit of ISP and link redundancy.
PS:
If your links were to the same ISP, different bundling technologies, e.g. MLPPP, would almost behave like a single link of the same bandwidth.
