I've ordered this stand and Gravity KSX 2 and, compared to Gravity, Roadworx feels much more stable. Also in addition to having 4 rubber caps (at the top, 2 per side), they've added rubber protectors in middle sections which allows you to position the piano close to the edge of the stand, without any wobbling! It was impossible to do with the Gravity stand.
And IMO that's really important if you want to sit while playing the piano, since positioning the piano at the edge of the stand gives more space for your knees.
At the beginning, I wasn't sure if an X-stand was going to do the job (visually and stability-wise), and was considering getting a original wooden stand from Kawai, but after testing it I have to say that it's pretty good and I just saved 100 EUR :D
Definitely recommended!