I am not sure that it would make that big a difference..Originally Posted by 565A5353505059404641350 link=1268443476/0#0 date=1268443476
The rotary will be much more silent and that would be the biggest change that you might see in the first instance.
If ya read up on pumps and then take into account how the OPV works (GP Pressure gauge post) you will also see how the OPV can also have an impact.
Secondly a reconditioned pump for $70 ? Parts and labour for 3/4hr... What sort of warranty ?
If only for quieter running... May be worth it... As to shot quality ??