Here's
The Proof!

The longer the host bar lasts, the longer the carbide stays sharp!

Different brands of wear rods were filed with a new 3/16" rat tail file (Nicolson #01888 file) and cut with a new hacksaw blade (Lenox #218HE hacksaw blade).

The results are shown below.

A host bar that can be filed will lose it's carbide inserts sooner.  This is especially true for host bars that can be cut through by a hacksaw blade.
Typical carbide rod wear patterns

Bergstrom Skegs 3/8" hardsurfaced wear rod hacksaw and file test results
The Bergstrom hardsurfacing was only polished... while the file was ruined

Their Rods – Their Spin

ACS - "Canada's Cutting Edge"
Hacksaw and file test results

Bottom Line - "High carbon steel for long wear"
Hacksaw and file test results
(Includes Ditchbanger, Simmons, Diggerz, C&A, Razor Bladez, R.C. / Riders Choice and Sled Mate brands)

Eversharp
Nice concept, but the steel would have to wear at the same rate as the carbide to work.  Since the steel will wear faster, the 3/64" (less than 1/16" thick) carbide will become exposed to the point when it will break due to the lack of side support.

Used Eversharp Carbide

Note how the carbide has broken away at the same rate the steel has worn

Eversharp 1999 Advertisement Drawings
Comparison Drawings
Gray portion of carbide indicates material Eversharp says wore off.  Eversharp advertisement The results (shown above) are impossible. Keep in mind that all high grade impact resistant carbide wears at the same rate under the same conditions. The style of host bar can affect the durability of the carbide by sharing some of the load, however Eversharp's style does not.
Bergstrom Skegs 6" carbide: 3/16" square - .0482 grams weight	Eversharp 6" carbide: 3/64" (less than 1/16") wide x 17/64" tall - .0164 grams weight
This is a 2.94 : 1 (Bergstrom : Eversharp) ratio in weight Carbide alone is a 2.94 : 1 wear ratio

Extreme Max - hacksaw and file test results

Kimpex - "High abrasion, resistant bar stock"
Hacksaw and file test results

Qualipieces - Cobra - Hacksaw and file test results
"They made no claims of durability"

The host bar is 3/8" wide and 1/2" tall

2012 Ad

Roetin - "Designed for long wear" "Exceptional durability"
X-10-One, X-PR1, X-PRT - hacksaw and file test results

Saber - "Quality second to none"
now Accord - "Toughest Bar on the market"
Hacksaw and file test results. You cannot file, much less hacksaw,
through real hardsurfacing as we did with this Saber wear rod.

Ski-doo - hacksaw and file test results

Sno-Stuff - "Provide exceptional wear resistance"
X-Calibar 1, X-Calibar 2, Plus 1, 2, 3, 4, 5
hacksaw and file test results

Snowtracker - "More durable than standard carbide runners."

Sport Series - hacksaw and file test results. You cannot file, much less hacksaw,
through real hardsurfacing as we did with this Saber (now Accord) wear rod.

Stud Boy - "Made to the highest standard in the industry"
Hacksaw and file test results

Stud Boy - Shaper Bar - "Great Wear"
Shaper Bars with 800 - 1000 miles

C&A Pro Outlaw Wear Rod - milage unknown   |   AC Shaper Bars

USI - stainless

See: www.bergstromskegs.com/pi/wear_ptn/hbdt.htm

USI Shaper Bar - "Super wear resistant hardened steel"
Shaper Bars with 800 - 1000 miles

C&A Pro Outlaw Wear Rod - milage unknown   |   AC Shaper Bars

Woody's - Snocross (used for one weekend of racing)
"The most advanced and durable runner on the market"

Yamaha - hacksaw and file test results

Through no fault of your own, your expectations are too low if you have been satisfied with any brand that you can File and Hacksaw through!