We've made a few batches of this cider.
The winning recipe we use is
1 can Blackrock mix
1kg Dextrose
500g Honey
About 4 litres of fresh apple juice (we get the local fruito to juice some up for us).
The last batch we did seems to be a bit over carbonated though. I actually had one bottle explode on me

The FG was 1008, and wasn't dropping any more, and we used the standard sugar scoop, so I've got no idea what went wrong with that batch.
They come out quite nice. I would agree with others from here, and say they're quite dry. I wouldn't mind trying adding some non fermentable sweetner at some stage, but as it stands, we have an oversupply of ciders!