For me it's a big thing. Despite having the opportunity to own Fender Precisions when I started playing in the 60's (and by now having enough value to retire on), I always hated their flatter profile. Feels like playing a plank. I now play a MIJ Westone Thunder III which I love. I just find the more curved radius more playable, and enjoy not feeling the angular edge of the fretboard. It's the main thing that puts me off getting a new bass. I'd say don't underestimate it!