There is no general consensus, just a lot of talk... this is a forum after all! (so no FAQ!)
The push-pull setup is good/bad:
it's good if you're trying to achieve a higher flow rate (of air) through a rad that has a lot of resistance. Both fans should be similar, and the idea is that the second fan helps the first one achieve its rated cfm at no load.
It's bad if there is little or no air flow resistance, because the second fan can't help the first one achieve its maximum air flow rate, as it's almost already there. The second fan only draws power, with little or no benefit.
Overall, the push-pull is good, if it's setup properly, and will be quieter than using a single more powerful fan, but not as energy efficient.
The other debated aspect is running fans side by side, and we've had that discussion already: see the thread about dual 120mms.
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