I purchased the Mighty Bright on Friday and found it to be very good after trying various positions on the Kobo. (these comments relate to using it while reading in bed.
1. It is very adjustable with the gooseneck and adjustable head. Positioning both the neck and head correctly can avoid shadows
2.The one or 2 light option is nice and using 1 bulb very comfortable
3.I initially positioned it on the top right hand corner, but seemed to throw the reader out of balance
4.I then put it on the bottom left corner which worked fine for a while until I noticed that it was flexing the Kobo frame which is not stiff enough there and was causing the glass edge of the reader to be exposed. DO NOT POSITION IT THERE as you could damage the reader
5.I placed it on the top left corner which seemed to work out the best and most comfortably and found it very good to read with.