Have you cut through chain-link fencing or hog wire with your Gerber?! It lacks a hardwire notch so it would be surprising that the cutters weren't damaged.
In the
Super Tool 300 topic, I cut through nails with a bunch of multi-tools. Didn't test the Gerbers (but mentioned it). Back in 2001, Doug Ritter busted the Gerber carbide cutters on some piano wire so I didn't think the cutter would make it through a nail. Well...I was right! Snapped the carbide cutters rather than the nail!
Luckily I have two more tries! Gerber's carbide cutters give you three tries (rotate them until all three sides are broken) and then you need to replace them. Leatherman's 154CM cutters can be removed and sharpened (or replaced).
When it comes to cutting hardwire, the older style Leatherman cutters perform quite well. The Leatherman Core actually cut
through the nail better (
photo) than the Super Tool 300 (
photo), which cut part way and snapped it apart. I'd skip the carbide cutters if you cut a lot of hard wire. You might consider the Core or one of the other Leatherman multi-tools - even the Leatherman Kick can cut through a nail.
Both the Gerber carbide cutters and the Leatherman 154CM cutters have a square edge. Here's a comparison photo of the edge on the Super Tool 300 and the SOG PowerAssist.
A square edge is more robust but the PowerAssist cutters cut more cleanly on stranded wire. Comparing the Leatherman 154CM and Gerber carbide cutters on stranded wire, the Leatherman cutters cut more cleanly and require less force. Notice that the edge cut with the Gerber is slightly smashed.
Victorinox and SOG also make very capable multi-tools (some of my favorites). Someone posted some nice photos of his results with the Victorinox SwissTool :
http://www.bladeforums.com/forums/showthread.php?t=694833 The cutters on the Victorinox SwissTool and SwissTool Spirit tend to mash through stranded wire than cutting it. Here's a photo showing the SwissTool Spirit jammed on stranded wire. I could actually suspend the SwissTool Spirit by the wire!
But the Victorinox cutters are quite capable when it comes to hardwire. One thing to consider is that the hardwire notches on Victorinox & SOG multi-tools are a little smaller than the notches on the Core and some of the other Leatherman multi-tools.