Since the Viper is really nothing but another variation on the Colt "D" frame revolver, it has the same attributes as the other "D"'s like the Detective Special and Cobra.
The aluminum frame of the Viper puts it in the Cobra-Agent class, and these are excellent guns in all respects.
The Viper is essentially a late model Colt Police Positive Special, only with an aluminum frame.
These "D" framed Colt's are strong, reliable, and usually the most accurate of all the small frame revolvers.
Where the Viper IS different, is in it's collect-ability.
The Viper was only made in one short production run, during one year.
As a low number, short production time Colt, collector interest is quite high, and collectors are actively hunting Viper's.
The Viper is one of the very rarest of the Colt "snake" revolvers, and for that reason, collector's trying to complete a Colt "snake" collection are especially interested in finding a Viper.
Because of the collect-ability, a Viper probably shouldn't be fired if it's in good condition, and pains should be made to keep the original box and EVERYTHING that was in the box with the gun.
This would include the plastic bag, hang tags, manual, and any other papers.
The box should be preserved as well as the gun.
If you have, or can buy a Viper, it should be treated as an investment which, like any collectible Colt, will likely skyrocket in value.