The RMS Beauty Blush Brush in 40B is praised by reviewer Raquel for its user-friendly design and soft bristles. Raquel appreciates the brush's thickness, which provides a secure grip for those who may be prone to dropping things. The brush's shorter bristles are also noted as beneficial for targeted application of blush. Raquel confirms that the brush works exceptionally well with cream blush, but may not pick up as much pigment with powder blush. However, this drawback can be seen as advantageous for achieving a more natural look. Overall, the Skin2Skin Blush Brush 40B by RMS Beauty is a versatile and effective tool for applying blush, particularly for those who prefer cream formulas.