I am a beginner and often want to do something practice-y when it would be inconvenient, rude or impractical to retrieve my guitar. I have considered purchasing these two items - a finger exercisor and a faux fretboard practice neck. I'm all in if they would be useful but I'm not sure if my fingers really need strengthening (I can even imagine it being counterproductive if strength comes at the expense of precision) or if the absence of sonic feedback from the fretboard would just encourage poor form. Anyone have any thoughts? Thanks as always.