I recently ordered the replacement buttons, opting to go for the same blue d-pad and Super Famicom face buttons as the press release pictures.
Although I found someone else to help install the buttons for me, installation was not too difficult and the end result is wonderful.
Aside from simply looking snazzy, the controls are much much more responsive and comfortable than before.
The d-pad membrane didn't need replacing or anything, using the same part all kinds of SNES, NES, Gameboy and Megadrive games I enjoy playing are far more enjoyable now, and I'm finally getting a lot of use out of the device compared to the past year or so since I got it.
Really, really happy with it.