These cars were sold with either the base model SOHC engine making 95 horsepower, or the sportier DOHC engine used in the GSi that made 130 horsepower. The GSi model also had a rear spoiler and a transmission tuned for better acceleration. Later GSi engines would make up to 140 horsepower, although they cost several thousand more than the early GSi's.
The Storm performed well for a small economy car. The 1992 Storm GSi could achieve 0-60mph in 7.3 seconds with a top speed of 125 mph. With better than average handling, that made the Storm GSi a great car for zipping around curves faster than the more expensive competition.
These cars are still out there on the used car market. They are cheap and fairly reliable. Don't be fooled by the Geo name, as they pack a surprising amount under the hood, making them a favorite of poor college students. With relatively low horsepower numbers compared to modern compact cars, the insurance rates on a Storm are more than reasonable. If you're thinking about buying one, check on eBay first. I suggest looking for a later model, the 1992 or 1993 model years. Put a premium on the GSi package, it is a much quicker car than the base model.