Pannier advice - Backroller Classic vs Classic Plus

Trying to find out whether the Ortlieb Backroller Plus offers any significant advantages over the Backroller Classic. I see its a different (presumably tougher) material and the mounting system is different - are they worth the extra £20?
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It comes down to which ones you like the look of best and how much you believe that most expensive always equates with best.
Fast and Bulbous
Peregrinations
Eddingtons: 80 (Metric); 60 (Imperial)
Actually I can - happened to have the Ortlieb catalogue handy. The back roller plus are 110g lighter than the classic while the front roller plus are 30g less than the classics.