I took the Intro to Sewing Machine Class and am now one week into the Fashion Lab. Diane is a great teacher -- she's enthusiastic about teaching and seems to know her stuff when it comes to sewing. The projects are a lot of fun and a great stress reliever after work! I knew nothing about sewing machines when I first came, but Diane created a welcoming environment for all levels. Her book is required for Fashion Lab (it's on the supply list on the web site, so she's up front about it), but I didn't feel like she kept trying to sell her book at all during the classes. She has a couple copies for sale at her studio (which she doesn't mention unless you ask), but freely tells people to buy it on Amazon, where you get a big discount. The classes can be on the expensive side, but it's Manhattan (and in a very convenient location at that!) , so what do you expect?!