I seem to recall that the Superb saloon came top, or high up in the CC or PC awards last year, so I think that the estate should be good too. PC plans an estate test soon.
It did, and having driven and towed for a short distance with an estate recently (albeit the 140 version), it was Superb! If it were me, I'd go for it without hesitation.
I have an Audi A4 Avant with the (I assume) same 170 PS engine and as far as the engine is concerned can tell you that it will tow with ease. 4 wheel drive would be better to be honest as it is a lot of power to put through front wheels when towing but you just have to develop the knack of feeding in the power.