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I purchased the black version around nine months ago and it's still going strong. The loops at the end of the spring also allow you to customise attachments, such as a longer lanyard or a different key-ring.
The one I purchased was approx. 17cm long from the top of one cylinder (above the coiled spring) to the bottom of the other. I can stretch it to approx. 82 cm, it might stretch further but I don't want to risk damaging it. I usually only stretch it around half that distance (approx. 40cm) so mine still seems as good as new after around nine months of use.
The length of the loop at the end of each cylinder is approx 15mm (so add 3cm to the above measurements, i.e. 20cm when not stretched). The key-ring is 2.5cm and the lanyard is approx. 6cm long.