I use felt and do not have to complain about the quality of the paper. I do not have a transparency problem on the next page.
Some pages are repetitive but overall the designs are pleasant coloring. Some models are quickly and others require patience and care. So plan for markers in addition to your usual markers.
I already ordered the more "Arabian Nights" and will buy me the third book "Mandalas". The theme of the windows not interesting to me at all ... otherwise it would have been on my shopping list as well.