This has been thoroughly discussed here. I even started a poll on EVSE options, and to date zero responders are paying for the SPX installation.
http://gm-volt.com/forum/showthread.php?5760
Buy the $490 Voltec from SPX and have a local electrician (who will be familiar with the permit process and knows the town boundaries) install it. If the layout of the panel and EVSE location are as you describe, a reasonable installation cost should be in the sub-$500 range. I installed my own with less than $100 in parts including wire, breaker, conduit and fittings.
Yes, SPX has been a pain to deal with, and their installation rates are outrageous. SPX typically deals with shipments of parts and tools to automotive dealerships and not the general public. I'm fairly sure that they haven't been in the business of contracting out electrical wiring services nationwide before.
I agree that GM blew it. In my opinion, they should have sold the chargers through the parts departments of dealers that have Volt allocations. The dealers' parts departments are accustomed to dealing with SPX and also with the general public.
The other place where they blew it was assuming that installing this equipment is rocket science. Every town where Volts are being sold will have local electrical contractors that the Volt owners can hire. Many Volt owners will have an electrician that is familiar with their home wiring. Also the type of customer who buys this car is more likely to be technical in nature and may be perfectly capable of performing minor home wiring such as adding a branch circuit.
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