Having used a Signum exclusively for near a year, I'm going to give you my best advice before buying.
The Signum is a deep machine on solo sitting targets.
The Signum is very average working around iron, don't believe in magic 'expert iron settings', the machine doesn't have the software/programming needed to work in iron like a Deus, Rutus etc
Don't believe the propaganda that the Signum can compete or outperform all other detectors.
Don't believe that the Signum is a professional detector and that is way it has soo many settings. It's more a fact that other manufacturers have worked out how to make professional level machines without the need for endless adjustments.
So if you want a deep pasture machine for solo sitting targets, the Signum is very good.
If you hunt in iron infested ground, buy something else!