I have purchased this plugin because it seemed that it can handle with variable product. I have checked it before in the documentation and the sandbox too, and looked fine. After the installation I have recognized that there are very few configuration and customization possibilities and the MAIN problem with this plugin was that when customer preorder the product, he/she has to pay something for it. Full, or partial amount that has to be paid, it means that the order goes through and will be placed in the webshop. In this period I am not able to modify the order, cannot add delivery cost, can do nothing with it, there will be an order wich is already paid, but without delivery cost.
They said that it is not problem, it is a feature, and it works fine: It means that the customer orders the product to be pre-ordered, pays the full amount, and then when the product becomes available, orders it again, this time with 0 amount, and then is charged shipping.
I have several problems with this. In Hungary, there is no such thing as a 0 ft product for accounting purposes, so I cannot issue an invoice for it.
The other is that it is inconceivable that the customer will order it again, there is no such thing in Hungary, no one ever does it, it will certainly not work.
So it does not work as I wanted, and as it was described in the documentation. This operation lacks any rationality, there are no such orders in life. In the real life, when somebody preorder a product, they have to be able to choose shipping too. Later then the product owner admitted that the plugin cannot handle with this, and offered this solution:
"if you need like that it is a part of paid customization. Need to modify the default functionality of the module. if you are interested in paid customization. please contact our sales"
I did not choose this, and since then I have deleted this plugin from my webshop, and do not use it. I am sorry, but it looked good.