I love my Hanna Alkalinity Checker, and use it almost daily (well, my tank is in the process of being moved, so I haven't used it for a couple weeks, but will be getting it set up soon, and will be again.)
I greatly appreciate the digital read out, and the lack of requirement of discerning a mild change in color to figure out a result. The process is simple, straightforward, and I have tremendous confidence in the results, having verified them many times when I first started using it.
My only complaint about my Hanna Checker is really my own fault, and that is I was not careful when ordering it, and instead of getting the one that displays the value in dKH, I got the one that displays the value in PPM, so I have to do a very simple math calculation for every reading to convert to dKh.