Product review (5 stars): My cost analysis by load.
Let me start of with "WOW"!  Our family of 5 - (Three of us full time and two more on weekends) has been apartment living without a dishwasher now for 5 years.  We do not have cupboard room in our current apartment for a built-in unit.  About 4 years ago, we considered a portable dishwasher on wheels but determined that we really didn't have the space for the large wheel-a-round.

While looking for a portable clothes washer, I stumbled onto Countertop Dishwashers.  My husband and I did a lot of research before we decided on the SPT brand.  The unit arrived a few days ago and I am so AMAZED.  I've put the washer through every test I can think of from delicate barware to saucepans and it has washed everything perfectly.  We are using the Cascade Platinum gel pacs and have found they work very well.

We are very conscious about electricity usage and I was unsure what this would cost.  I plugged it into our "Kill-A-Watt" usage meter to track actual use.  Our Edison rate is .25 per Kwh.

Our Per Load Power Cost
Heavy -  $0.10
Normal - $0.09
Light - $0.07
Glass - $0.07
Speed - $0.06
Soak - $0.01

The manufacturer states the water usage is:

Heavy -  3.83 gal
Normal - 3.17 gal
Light - 3.17 gal
Glass - 2.56 gal
Speed - 3.17 gal
Soak -  .66 gal

Again - I have to say I'm AMAZED at this dishwasher.  Not only does it do a wonderful job, it is going to save me money because the electricity costs are low and the water usage considerably less than hand washing and rinsing.

Update:  I have found that with our family of four kids,  Our cost per month is calculated at $5.05 for the dishwasher.