I've had variations on the cornflake-based butterfinger substitute a few times. They're not especially like an actual Butterfinger bar, but they are very good as chocolate bars in their own right. This one was good, filling is a little smoother than average, so comes off more like a giant pb cup, but it's a really solid thing, PB flavour good and strong and the chocolate layer was almost as thick as the core, set softish, rather than a glassy temper, so biteable. Definitely enjoyable.