I would tell you about my SN addiction but the length of post would break the server. Put it this way, I've never found anything elsewhere to beat SN for Lippies, Eyeshadow and Skincare. (skincare being my pet subject, when I was employed (currently a non-salaried carer) I enjoyed some very prestigious salon brands).
Without exception, the SN serums delivered visibly better results by far. Some are so potent and powerful that you need to work up to them but the results are demonstrably outstanding. I could wax rhapsodical about the finesse and wearability of the eyeshadows - Idolize in particular transforms from an unassuming greyish powder or even a fairly boring back-of-hand swatch into something magical around the eye.
As for the lippies, I would put my dependence upon them for moisture at borderline medical need!

Nothing else protects like it. Of course, the pleasure factor and colour enjoyment is right up there on the scale, too.
Ask for colour recommendations and the answers will almost always be subjective based upon personal taste and experience of the person giving the recommendation but here, whatever you may or may not like colour-wise, the products all work superbly.
The whole SN line is notable for quality but none more so than in regards to the quality of customer service and the friendly, open and sincerely caring manner with which this business and forum are run. However else the products may excel, that's what keeps me here gladly.