Most everything I've done here lately(just breaking out) has been 5G and have done several 2G on 90 degree elbows and such. Can't say about the 6G and boiler stuff, just can't seem to muster any sort of desire to do any of that stuff. Ran a couple uphills and root good, just not interested. Just seems hard until you get it, then it's not so bad, just another weld. You get out into the real world and that's an entirely different nut to crack, perfect line up, gap etc......