This arrived in my inbox this afternoon. It seemed a bit odd that they are pitching this as a special offer, but after playing with it for a bit, it does seem to be useful in that it picked out the best ongoing deal, compared to the best first year deal. We are are on VDSL with an unlimited Spark contract, and we get 49Mb/s down, and 10.5Mb/s which is not too bad as we are rural at Rapaura (nr Blenheim) and effectively 1km from the cabinet. We have had fibre running across the road from us for years, but there are no plans to let us connect to it.
The Try it now link resolves to https://www.trademe.co.nz/compare/
Although I can't help but suspect that everyone in the country with a TradeMe account received the same 'offer' today.