I have dual AIMs 12,000w 240v/120v and chose them because of ETL listing. The main one ran 5yrs / 25,000hrs and then the control board starting acting up - started putting out unsteady 240v/120v causing my UPSs to cycle several times a second.
AIMS support strung me along a few months and eventually refused to provide replacement control board. I was able to get the control board refurbished (mostly capacitors replaced) at a general electronics repair place for $500 - but I would not recommend AIMS any more as 5yrs seems a pretty short of life-span for the $!
While working to repair the AIMS, I went SGP 12,000w 240v/120v as they are one of the cheapest ETL certified around and 'fit' into my inverter area and happy so far but only 700hrs to date. We'll see how long it lasts
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