I got a shiraz too, to compare with the Youngs cellar 7 version, which didn't taste like shiraz, but the Muntons premium chardonnay and sauvignon blanc were the same in that respect.
But, in terms of reds, I have yet to find anything to beat Californian Connoisseur on a authenticity/price/quality/longevity analysis, so far. On a scale where a basic sugar mash might be zero and pure vintage varietal grape juice might be 10, I would place Wilco brand kits at 1, Youngs Winebuddy at 2, Muntons premium and Youngs cellar 7 at 4