Most people just use incident metering in the studio with flash
Originally Posted by 77seriesiii
You need to check for brightness ratio (bright side to low side) - but thats about it.
You can spot meter in the studio in the same way you spot meter outside - just make sure you take the spot readings from the camera position and watch out for flare from the flash heads.
If you use spot readings a lot outside then you perhaps might want the feature for flash.
Personally, I use a lot of spot meter readings outside for landscapes but have almost never felt the need to spot meter in the studio
The Kenko units are good, as are the Sekonic and Gossen units.