I have the ASM G5.
I am using it on a system of approx. 525G. I bought the ASM when they first came out to replace a PM Bullet II.
It has performed to expectation and beyond for 4 years now.
The ER looks to be better constructed however I would not pay 1 cent more for it over the ASM. Now that being said, if you are going to use ozone in your system then the ER is the one to buy as the ASM will not take the use of ozone.
It is only a skimmer. They both do an equal job. I have not seen too many hobbyist kick around their equipment to the point that better construction is an advantage. I see people out buying cast acrylic over extruded and paying 3 and 4 times the cost for what its only a Skimmer or Calcium Reactor. They both do the same job.
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