I have a National with the sm7 tip on one oxyxon and works fine. Although it would do better with more oxygen. I went from tanked oxy to an oxycon and the flame is much different (softer) but it gets plenty hot to do soft glass. From what I've read it uses more oxygen than other torches but my experience is only with them National 8m and have never used any other torches. I think it's a good torch for the price and I also bought it for all the reasons listed above. Just starting into lampworking and not sure how large or small I want to go. 
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~~Suzanne~~
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