Never heard of anyone with them.
They seem to be David Hendry's preferred suspension though - presumably cos they're a ZeroSport importer. Apart from that never seen 'em advertised in the mags, and certainly not ever seen 'em on a Foz.
AST have a new design strut which has a thicker and stronger rod than before, I will be changing to these next month after having found a leak in my rear near side one.
IMHO get something that you can service in the UK.