I use a Regalia that I bought from Kimberly at
www.pyronamix.com.
I absolutely love my combination of torch & concentrator, and I am not seeing any difference between the Regalia & tanked oxy for my use.
I am on the schedule to test my Regalia with Kimberly's oxygen analyze when she gets back from GAS, and I am sure that she will post results then.
Let me know if I can provide any further info.