Waterloo 2015: Safe Tickets?

I'd like to attend the Waterloo bicentenary re-enactment next June, and I've been looking at ticket offers on a site run by some outfit called sherpa.be. It seems to be pukka, but before I commit any hard cash I'd like to know whether anybody else has had dealings with it. All contributions gratefully received (and apologies if this has already been covered, as a search proved negative).
Much obliged, and I'll buy the tickets straight away - even at 50-odd euros each they'll probably sell out soon enough.

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