The real advantage of this particular technique is the ease of handling the plants throughout the growth, and the compatibility with many physiological assays. The paper contains many tips and tricks for getting good plant growth in the lab in general, including solution design and macros for measuring growth from images of the plants. The technique is useful for other plants too.
In the first week of being online the paper was viewed over 1000 times and is currently ranked second in terms of impact as measured by altmetrics for all Plant Methods papers, first for papers of a similar age.
Here is a video that accompanies the paper, outlining the technique.