Product review (4 stars): Placement within dishwasher is critical to successful operation of this gadget
I was super excited about this product when it was initially going to be a project at one of the large crowd funding sites.  I loved the idea of how it would work and really liked the thought that it would just plain work and not require myself or others in the household to remember to change the magnetic sign that we hang on the door or pay attention to the light that shows that the dishes were washed (as soon as someone opens the door to the dishwasher that light goes out, so it isn't reliable if someone doesn't put the dishes away after opening the door).

The problem that keeps me from giving this five stars is that this little gadget is a bit touchy about placement within the dishwasher and for some potential users it may keep this from being a usable solution at all.  Basically the gadget needs to be placed somewhere it will get covered with plenty of water.  Without enough water to float the indicator there's no way to get the gadget to register at all, so if you over-fill your dishwasher or if your dishwasher is super-efficient and doesn't use much water you may find that you aren't able to use this gadget at all.

During the first few weeks of use in my household we had mixed results.  It was a little frustrating given the hope and faith I was wanting to place in this gadget.  I contacted the manufacturer/inventor and got some feedback that mentioned the placement of the gadget and how important it is to get a lot of water flow in and immediately around the device.  The suggestions pointed me in the right direction for making it work more reliably, though I would note that given my spousal units propensity to crowd things into the dishwasher and possibly block things a bit from larger objects placed in front of smaller ones, it hasn't been that easy to find a spot to place this gadget that works 100% of the time.