Silverleaf,
Yes I have this, price was right,ie nix, from a neighbour who tore it out of the front lawn (where the previous resident had put his veggies on display!), on aquiring the house and consigned it to a skip.
Sizes are right for a raised bed, and can be built up using longer dowels above the 150mm unit height.
Yes it works but needs better anchorage to hold a strait line, bows under pressure and allows a cosy home within the twinwall structure for snails and ants. It seems durable, mine is probably ten years old and although some holes are evident, these may well be damage from fork use.
Would I buy it? Not at the online prices !, but would accept more as a gift.