Last year, I went to a Chevy dealer and looked over a Volt and drove it... here are my observations and impressions:
First, it is kinda cramped inside for a 6 ft guy weighing in over 200#. And I suspect anyone over 5'6" would be cramped in the rear seats. The console goes through the foot area and between the rear seats... the battery is in there. It is STRICTLY a 4 person car... NO 5th person in the middle of the back.
The luggage area is too small, and IMO the gas tank is too small also. Since the car is built on a chassis of another vehicle (I think the Cruz/Malibu), there were lots of compromises to make. IMO the car really needs about 1/2 again more luggage and gas tank space.
On to driving. One thing I can say for the car... it is FAST! When driving in full elec mode (before the gas engine kicks in for true hybrid drive (like a train engine), one can get literally 245 HP into the drivetrain... And as we know; Elec motors develop full torque almost throughout their entire RPM range... thus the car literally LEAPS when you put your foot down!
The car is nice to drive, nimble handling and good road feel. Rear quarter vision is not that good, given the hatchback design, however I learned quickly how to cover the blind spots in the mirrors. The cutesy panel on the center dash telling you what the drivetrain is doing (like in a Prius) is NOT well thought out... IMO GM needs to take some lessons from Toyota here.
One complaint I had with the computer management of the drivetrain: There is NO WAY to recharge the battery while driving at freeway or highway speeds... on can only charge the battery by plugging it in... I read somewhere this was govt mandated (the not charging while driving). Not sure what goofy idea the govt had this time...
Then there is the battery issue... having a battery catch on fire... well that needs to be fixed.
Personally, the car costs too much IMO. Something around $27-28K would be reasonable... however IMO the car needs a lot better battery... like around 50-60 miles before gas usage. This is beyond GM's control, as I do not think the battery technology is there yet.
IMO the idea is a good one, the R&D to develop the technology probably kept GM's engineers on GM's payroll (rather than China motors payroll), until the recession eased... not too bad a thing IMO.
Is the car 'green? Yeah. Is it worthwhile... maybe to some.
I believe there IS a market for this kind of car... albeit it is a specialty market... and will be a small segment of the auto world. Think about someone that lives in a city and drives short distances (a few miles at a time)... and they can plug in their car whenever they want. Theoretically they could go mos between buying gas. IMO good to take it on a 'sunday drive' to run the gas engine though.
Personally, give me a BIG iron sled, with a HUGE V-8 with loads of torque and HP... and noisy exhaust... and I am happy... <grin>...