Dad bought one back in the late 70's and we used it to cut firewood for three farm houses for several years. I didn't know at that time it was a heavy/unpowered POS. It just kept on running and doing fine for what we were doing with it. I made the mistake of running a good friends Husqvarna 2100 and absolutely fell in love with that saw. Being a dirt poor farm boy, a Husqvarna wasn't even on my wish list, so I just kept cutting with the Mac 610. A few years later, I was laid off for the Winter, and took the plunge to buy a 2100, having plans for selling firewood to pay the bills. Ended up with a 480CD instead, and still have it today. It looks and runs as good today as the day I bought it.
We retired the Mac 610. A few years ago, I was over at dad's going thru some stuff and found the 610. I cleaned it up, cleaned out the carb and fuel system, and she fired right up. I took it on one outing, then gave it back to dad, who ended up selling it at a yard sale. The 610 wasn't even on par with one of my closed port 55's, and I knew it would just sit in my shop and collect dust. I'm glad someone else got it, and hope it is still serving them well today.......Cliff