Pros: Gives you 100 mpg e mode and over 80 mph with assist.
Cons: Lead acid batteries are good for about 3 years.
I just had a PHEV conversion from Plug in Supply installed by www.autobeyours.com I am highly sastified with the work and it is awesome! I can now plug into my solar array and get free power! The PHEV will go 12-15 miles in pure EV mode under 52 mph with no noticeable loss of any function. With PHEV assist, the car will gain several mpg on a tank. Some people are getting 1100 miles per tank of gas (11.9 capacity). I had my conversion done from salvage. Check out my blog at www.phevprius.blogspot.com.