The camera is silent and compact enough not to draw too much attention. With a TLR you can be the next Vivian Maier.
I'm not much of a street photographer but if I was, this camera would be perfect for the job. Not the loud shutter sounds of the Kiev-88 or my Pentaxt 645. However I love to hike. Bringing the Kiev of Pentax would be a back breaker. The lightweight TLR always fits my backpack.
Some photos taken with the Yashica-D:
Deventer on B&W film - Yashica-D
Deventer on B&W film - Yashica-D
Nijmegen on B&W film - Yashica-D
Nijmegen on B&W film - Yashica-D
Double exposure - Yashica-D
Nijmegen on B&W film - Yashica-D
Double exposure - Yashica-D
Lightweight Yashica-D is great to bring on a hike