i don't know when bellaboo starting using this paper but i've been using it for almost 3 years for paper piecing.
since i've been coming to this forum the subject comes up from time to time about what people use for paper piecing and i always speak highly of the product.
i don't think its the most popular paper on the forum but its users have increased.
if you do a forum search on the subject i think you'll find most people prefer to use less expensive copy paper.