Last year I switched to an M-15 to have more power for boro, but before that I used the same model for several years. It's a workhorse. I can't bring myself to sell my old one so I'm keeping it as backup. When I needed replacement filters, I purchased them off ebay.
If you want a bit more power, you can add a 7lb holding tank. There are directions on how to build one on LE and I think the supplies only cost around $20. When the machine "breathes" the holding tank keeps the pressure to the torch steady. I found the tank worked really well with this oxycon.
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Kathy
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