SolarTek Energy International review: Power optimizer

We paid SolarTek $2,300 back in March 2011. They said the optimizer would reduce the consumption of electricity by up t0 30% to 47%. The first year it did seem that our electric bill went down slightly. And then we just forgot about it. I don't see where this is doing anything to affect our electric bill. I think this was a total scam and do not understand how we fell for this. I have no info or instructions on the different settings on this unit. Wish I would have researched this better back then.