We were talking about this at my sw group last week. They make lovely chips with a teaspoon of oil (which you'll need to syn), but they take 45 minutes, and you can't cook enough for a large family, so if you're cooking for a few people it's a bit impractical as they delay between batches is too long.
If there are just 2 of you, my group recommended them.
Tbh at £100 and 45 minutes i'm going to stick with sw chips! My group leader doesn't parboil her chips, which makes them a bit less labour intensive as well.