New Ion's cost £150 - 2nd hand ones go for around £100 and like the Impy that often includes an upgrade or two (eg. clamping feedneck).I've used a couple, and back to one now cos of a lack of funds - for the price they go for nowadays they're worth picking up as a starter marker...specially if you can get hold of a factory cut..they're a bit more solidly made than the ion, but heavier and blockier. compare an ION at £150 2nd hand and an impulse (usually upgraded) at around the £80-100 mark, it's definitely a good budget option....I can't say i've ever had any complaints with the impulse as a reliable marker.