My Park ones are the worst I’ve had, as above, blunted very fast. Retired for spokes and non-bike metal cutting now, which to be fair, they’re good at. But bike cables need an edge. I got the impression that most reviews consist of people/mags buying them, cutting 2 gear cables and then calling them great.
I believe these are the ones I have:
http://www.ebay.co.uk/itm/Sealey-Wire-Rope-Spring-Cutter-190mm-Pliers-Cutters-Cable-Work-Tools-AK503-/191569982194?pt=LH_DefaultDomain_3&hash=item2c9a75f2f2
Hard to tell, with rebadgers, quality can vary on identical-looking products. Mine are fantastic though. Sharp, long lived, they’ve outlasted the Parks by some ridiculous amount. They get rebadged by some bike companies, too, as a wee nod of approval.
The Lifeline/Superstar ones are decent- cheaper and better than Park, and they have a nice spike on the side to unsquish outers, but they don’t last as long as those ones I linked.