Pam - I guess it all depends on if one wants to change how one works in order to accommodate a torch. Personally I work very close to the torch face most of the time (about 2") and have no intention on working farther away. Moreover, I believe the OG20 you have (did I remember that correctly?) probably has better purity than the M15s. The purer the oxygen, the less carbon buildup the Cricket and the Bobcat tend to have, thus tanked oxygen works best for those torches in that respect.