Bob,
I have not personally used one or tried their software, but they are an inexpensive board level PLC.
However, if something is inexpensive, but you have to add components to it in order to accomplish your goal...it isn't really a value to begin with.
I had an opportunity to view the product information from the link that you provided with your profile. I saw on at least one of your products that you are using a load cell. With the Tri PLC you will still require an amplifier to bring the load cell voltage up to the analog input voltage of the PLC.
Tri has been around for a while, so they must have decent product.
God Bless,