single link has only 56 polygons and it can be meshsmoothed.
model is also unwrapped and textured (texture and material included)
how it works: there is chain link and curve - when you stretch the curve, number of link is increased according to the length of the curve. you can also deform curve as you want and chain is deformed in the shape of the curve
product is also easy to animate
you can easily export any of result to common formats (3ds, obj, xsi, lwo and more other)