I would have to agree with Bob.
Despite all the stick they receive and the endless plastic spoon jokes, the Ion has changed the face of the paintball marker market.
Since it's introduction marker prices both new and to a greater extent second hand have dropeed in an attempt to compete (not directly i.e Ego vs Ion, Ego wins no contest).
Other companies have now followed suit to a degree with examples being the PMR and the Etek (again not comparing them to an Ion, only the philosiphy of an lower priced marker).
The Ion has helped act as a stepping stone into our sport allowing new comers to purchase a marker that can compete with most others ourt there but still leave them with enough money to buy some paint to use with it.
For those reasons I see the Ion as being a modern classic.
P.s. I don't own an Ion