I have RAPCO{both RAPCO Brand and Stihl Brand made by RAPCO] and Stihl Made in Switzerland Carbide blade's.
At the current project I am at I requested carbide chainsaw blades and the Company Superintendent order me 10 new blades{Yes, $2,000.00 is blades]
We are cutting CCA 4 X 6 and 12 X 12, hundreds of them and many are also rip cut.
Yes they are worth it.
Try One You will not regret it.
Yes, sharping requires diamond, we just send them out.
Also look at the DIAMONDIZED SAW CHAIN{it is tungsten carbide enbedded] by Total / Tecomec Brand, under SPECIAL APPLICATION SAW CHAIN;
I was Quoted a price of $52.75{for 3/8, 84 link, .050 - Diamondized chain] from a local dealer.
I have never tried them, they{Diamondized chain] can be sharpened with a regular file.
From Total / Tecomec web site;
"Diamondization" is a special application of Tungsten Carbide to standard saw chain. Diamondized chain will not chip, crack, or peel in the most severe cutting conditions. It will cut up to five times as much dirty wood per chain, as it holds its edge ten times longer between sharpening than standard chain.
Ideal for any abrasive cutting condition . . . bulldozed logs, railroad ties, sand-embedded bark, etc. Once sharpened with a grinder to remove spillover Tungsten Carbide on the leading edge, Diamondized cutters can be filed effectively with a regular chain saw file"
See URL;
http://www.tiltonequipment.com/Total_Catalog_Pages/Tilton_Special_Saw_Chain_page.html
Regards
Joseph