30" mirror is perfect size over 25" pedestal sink.  Plenty of viewing area, good reflective quality without waver or warping.  Wood frame is substantial without being chunky,  adds warmth to the tile behind it.  If your light fixture hangs down in front of the mirror, be sure you allow for the depth of the frame.
It is weighty, my contractor installed it into a stud.  If you are installing in drywall, it would take heavy-duty reinforcement.  It has only one hanger in the back, so I used double-sided tape to prevent it from moving when bumped.  It is beautiful.