I have a 2001 Toyota Prius (bought in 2001) with over 150,000 km on it and still drives great. Haven't yet change the brake pads yet since regenerative braking does most of the stopping. The main traction battery has never had any problems, either. Want full power? Just floor it, and you can't damage the car in any way (computer won't allow redlining of the gas engine). Prius' electric motors provide their maximum torque over a large range of RPMs, including zero RPM, which gives great acceleration at standstill. Yes, the acceleration in generation 1 Prius between 30~50 kph may not be stellar (unless you floor it or drive a generation 2/3 Prius

, but its acceleration is great at higher and highway speeds.
People in PA and NY drive hybrids and it gets much colder out there. I'd imagine they must do decently otherwise people wouldn't keep them. They seem to do well on the highway as well - PA especially, your main mode of transportation are 105km/h interstates (minimum speed is 90km/h).
I would never ever ever drive a Prius because they don't come in manual. I refuse to own an automatic, especially if there's a chance of winter weather. If I bought a hybrid, I'd want either a Honda Insight, Honda Civic Hybrid, or a Smart Car.
I am not sure about other hybrids, but Prius surely works in cold weather--in interior Alaska in the middle of the winter, no less! By the way, Prius does not have transmission, automatic or manual, in the traditional sense. It has what is called a transaxle which consists of two electric motors/generators and the internal combustion engine in a planetary arrangement. There is zero shifting, you go from 0 to ~170 km/h in one smooth action.
Actually on all the mainstream Hybrids that are currently on the road, the electricity comes from the small gasoline engine/generator in the car.
There are some plug-in Hybrids (one made right here in the lower mainland), but transport canada has chosen to not make them legal. In the USA, they can be licensed, but are restricted to 40 mph.
What do you mean? Plug-in hybrids are not speed-limited in anyway and are legal in Canada. Did you mean NEV (up to 25mph/40kph)? Plug-in hybrids are just like any other cars on the road, but with some pure electric range or extended high efficiency range.
It is possible to get a kit that changes a Ford Escape/Toyota Prius into a plug in Hybrid, but installation of the kit voids your warranty.
This is not necessarily true. There are many commercial kits that don't modify the existing components in any way and thus do not void the warranty.
In about 5 years or whenever the batteries require replacement the cost of the batteries would be equal to every nickle of gas you've saved over the years. So unless your a taxi it's not worth it.
Buying a hybrid will not make sense money-wise, unless you drive a lot. I'd say over the last 8 years about 7000 litres of gasoline were saved in my Prius.