Really like!
*Edit 2 - even more features have stopped working, such as simply being able to name the patterns. Developer website linked to Apple Store no longer exists which makes me think the app won’t be updated ever to fix issues. Still functional but frustrating to use. *Edited - some features aren’t showing up in the app anymore, if I go into a pattern there is no way to get out without exiting the app and relaunching. Still functional, but can be frustrating to use if you have a lot of patterns.* It’s fairly easy to use, I have had some issues with images having large gaps in the preview when I adjust the page number in increments of 20 (it seems to only really like 400 or 600 page books) but that may just be a preview viewing issue not a problem with the pattern. Being able to print them out is very helpful as well. Definitely worth the cost of the app!