Backlight on the BM857A is rather poor, but the viewing angle is also fairly limited. So if you're looking at it sideways, forget it.
FWIW, another thing to be careful with, is the fuses don't meet the CAT ratings in mine (CAT is 600V, and they used 500V fuses). Not the end of the world, and they can be upgraded with the correct fuses (just need the correct fuse clips soldered in). Rebranded versions may not have this issue (IIRC, the Extech MM560A comes with 600V fuses, which I presume was per Extech's request).