I agree the AIR can be finicky as some work great some don't, I had a few problems with mine but fixed them and all was good...and it was last used to run a Speed and I don't have the LP adaptation and it didn't drop off or fail to recharge quickly or anything, that to be honest is an urban myth. You may find that the recharge rates are lower than other regulators but the AIR is still plenty quick enough but faster recharge is always good but don't knock something that in actual use is fine for the job 
The downsides of the AIR are the weight, the lack of an on/off tap other than that careful filling takes care of most all of the other possible problems.
I now use an inline Max-Flo and it was swapped purely for the weight problem(?) the only problem I have had with the inline is the on/off O ring failed but that was a simple fix. I did replace the fittings for proper pressure rated ones and to do so I had to also remove the inlet nipple so a little more space would have been nice but it didn't take that long oh and the other thing that failed was the inlet feed nipple but again simply an O ring and it was fixed, both of the failures could happen on any regulator so don't take that as dig against the Max-Flo specifically.
The downsides of the AIR are the weight, the lack of an on/off tap other than that careful filling takes care of most all of the other possible problems.I now use an inline Max-Flo and it was swapped purely for the weight problem(?) the only problem I have had with the inline is the on/off O ring failed but that was a simple fix. I did replace the fittings for proper pressure rated ones and to do so I had to also remove the inlet nipple so a little more space would have been nice but it didn't take that long oh and the other thing that failed was the inlet feed nipple but again simply an O ring and it was fixed, both of the failures could happen on any regulator so don't take that as dig against the Max-Flo specifically.
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