I got one of these about 2 weeks ago.
Its essentially a profilux ghl doser. The pump heads are quite robust and the motors seem to be decent quality. The body has a cheap plastic/hollow feel to it. The buttons are not that precise.
The calibration is fairly precise - didn't really have to tinker with it that much.
The bracket set it comes with was fairly useless for me - I ended up making my own bracket.
You basically set number of times a day, interval (i.e every x days for non-daily use) - 0 for daily, mL and times.
As for power-outage - when I got it I played with some of the settings - unplugged it and came back in an hours and it still had the settings. I think it will lose the setting eventually if the power is out long enough (probably a capacitor to hold power for the setting).
Couldn't be happier - beats the heck out of my Marine Magic and I just don't seem myself spending $500 for a doser.