Ours is a very well known brand (pm me if youd like to know) but I must say it doesn't clean even nearly as well as our old top loader. Our clothes get super dirty, the kids favourite play is in the sandpit/with dirt, and hubby works in the mines.
As a PP said, some loads I need to put through twice to get them clean (I use omo ultimate too, not a cheapo detergent), as DH will complain about his clothes smelling if I don't.

The benefits, yes - super super quiet! Does save water and electricity, however I do wonder if this is really accurate with how often it's now running compared to my top loader.