I bought my HPWC together with the car for $1200 with free shipping. I installed a 40 amp outlet and that charges 23 miles an hour. It seems to do the trick so far because I have a Red 60 kwh and did two 100 mile road trips since I got the car . On a daily basis I do 30 miles a day. I have the car only 3 weeks , delivery date 5/06. However I have a house and my neighbor shares the driveway so I can't leave the car parked in the driveway too long because its a shared driveway and garage is way back into a narrow driveway which I only 4 inches or room on each side! The 40 amp outlet is in front of the driveway so I got to park it there after a road trip for about 5 hours. In order to install the HPWC I have to upgrade my electrical panel from 100 amp to 200 amp and thats $3000 service upgrade. Tesla sent me a return FEDEX slip to return it. I don't know what to do ? Even if I upgrade , I heard that HPWC currently gets double that what I'm getting on the 40 amp and thats 46 miles an hour so that would be about two hours of charge for the average road trip. I have the twin chargers and use the HPWC at the Tesla store in Short Hills Mall, NJ (60 amp HPWC) if I have to take 100 mile trip to PA. I can return it now and buy it later on Tesla website if I really need it and pay for shipping which is $40 or more? But I gotta pay for shipping!