Extremely easy to read full information digital viewfinder readout. The side of grip has a hidden panel where you can set the LED brightness. On the right side, vertically, is the exposure LCD indicators including spot readings and frame remaining. Multiple exposure capability , up to 9 exposures possible. I wish Nikon did it this well.
Manual half stop settings.
Six Interchangeable bright focusing screens. Screens are interchanged through the mirror box with a special tool provided with the screen. My favorite is the hard to find Type L with central rangefinder split into four parts. While the T90 does not have interchangeable finders, the Canon 90 degree angle viewer which attaches to the eyepiece does an excellent job. A silicon cell in the bottom of the mirror box reads flash off the film plane during exposure.