I have started to compile the pros and cons of some of the popular options available to convert a standard Prius to plug-in with aftermarket kits. The attached spreadsheet is there for all who want to add, correct and/or update it. I included the new Toyota Pius PHEV as a 'peg in the ground' for comparison purposes only. Those who consider converting their Prius to a plug-in might find this interesting and informational.
The search box at the top of the screen on the right, I find it very useful when looking for anything in priuschat, try it and see