Flarm and stealth

As the US gets ready for the arrival of flarm, a big question on many
US pilot's minds is, what about stealth mode? From an armchair
piloting point of view, it seems that seeing gliders in a several km
range, with climb rates attached, could be a major competitive
issue. With this in mind, whether to require stealth mode in
competitions is being actively debated.

I'd like to hear from our European friends with lots of contest
experience, just how this is playing out. Do you find that non-stealth
displays are in fact very useful? Where stealth mode is either not
required or not enforced (WGC), is it becoming de rigeur to have a
secondary display and follow the gaggle with your flarm? Or are the
theoretical advantages overstated, and in the real world flarm
leeching isn't that big an issue; you're better off looking out the
window and seeing who is racked up in a tight turn?

Where stealth mode is required, is it being enforced, and how much of
a pain is that proving to be? Certainly the obvious protocol,
involving cockpit checks for hidden flarms, daily submission of flight
logs, and penalties for absence of such logs, seems rather onerous.

Thanks in advance. We are fortunate to have your experience so we
don't have to rethink this all from scratch!

John Cochrane