Seen these advertised at less than a 100 notes.

Are they any good? Do you get what you pay for?

AREA
(all replies eagerly awaited).

 

I suspect that you get what you pay for, although Bel stuff is generally a cut above the rest (I run a Euro 550 myself)
for £100 notes you should normally expect lots of false alarms, and very little warning of Gatsos (I ran several £100 snoopers etc before buying this unit and none of them were any good)

 

have a look on good old e bay, bought a euro 550 for £100 boxed and mint about a year ago.