No first hand experience, but the below info might help you. I found this on the Huron Scuba Adventure site
[TABLE="width: 521"]
[TR]
[TD]Manufacturer & Nominal Capacity[/TD]
[TD]Service pressure, psi[/TD]
[TD]Actual air capacity, ft3[/TD]
[TD]Outer diameter, in[/TD]
[TD]Length without valve, in[/TD]
[TD]Empty weight, lbs (w/o valve)[/TD]
[TD]Buoyancy Empty, lbs (w/valve)[/TD]
[TD]Buoyancy Full, lbs (w/valve)[/TD]
[/TR]
[TR]
[TD]Catalina S19[/TD]
[TD="align: right"]3000[/TD]
[TD="align: right"]19[/TD]
[TD="align: right"]4.38[/TD]
[TD="align: right"]17.4[/TD]
[TD="align: right"]7.8[/TD]
[TD="align: right"]0[/TD]
[TD="align: right"]-1.3[/TD]
[/TR]
[TR]
[TD]Luxfer 19[/TD]
[TD="align: right"]3000[/TD]
[TD="align: right"]19.9[/TD]
[TD="align: right"]4.37[/TD]
[TD="align: right"]18.56[/TD]
[TD="align: right"]8.09[/TD]
[TD="align: right"]0.12[/TD]
[TD="align: right"]-1.37[/TD]
[/TR]
[/TABLE]