I took the decision to fit FLARM to my glider (total cost just over £650) for the 'Red Box' variant after having a conflict alert in a FLARM equipped club glider in Nth Yorkshire a year or so ago.
It does not and should not replace a good look-out discipline but I have already had one conflict alert with another FLARM equipped glider when we were approaching virtually head on at similar altitude. Would I have seen it? I'd like to think so but with FLARM it immediately drew my eyes to the bit of sky where the contact appeared and avoiding action was taken with no drama.
Money well spent? I think so and you get an extra IGC approved logger too!