I own an asm G4+,and I can say the pumps on these skimmers suck.The sedras are not very good pumps for skimmer use.A lot of peopl have there own opinion,but a lot of them dont even know how much air the pump is pulling.For a 900gph pump mine only pulls 15 scfh with the stock needle wheel.I have the mesh to mod it with,but the mesh will not help the pump to pull in more air,it only aids in chopping up the bubbles better then the needlewheel.
Personally if your looking into asm,I would go with an msx instead.My friend just recently bought an msx 200 for his system and it performs very well straight out the box.With a little tweaking it can perform even better.No matter what you do to the sedra pumps they will not perform much better.Well this has been my experience with several of sedra 9000's that I have toyed with.