Indeed, and a lot of the posts in here are just people passing on rubbish second hand.
As for racing on cast rims, I have used only 2 styles of rims on my car (about 200kg) lighter than Duncan's. Both are cast. Neither style have broken in 7 years of abuse, no sign of cracks. It is rubbish to suggest any cast rim is a death trap and any forged rim will never have an issue.
We have broken 2 wheels but both were in big accidents so no complaint.
As pointed out earlier you only get to choose 2 of out cheap, light and strong. I go for cheap and strong, the wheels are damn heavy with the extra material.