Ok what is most uncomfortable, challenging 4 string (maaaaaybe 5) bass to play... The bass that bites back, that's not handed to you on a silver platter, something you have to work hard to play, like a bull trying to throw you off it's back. A bass that is just... A WILD BEAST WAITING TO BE TAMED! NOTE THIS: IT HAS SOUND GOOD! IT SOUNDS FANTASTIC BUT FEELS HORRIFIC! TRY TO INCLUDE THESE AS MUCH AS YOU CAN AND FIND BASSES THAT HAVE A LOT OF THESE FEATURES: heavy, lot of neck dive, fat chunky neck, little to NO body cuts, awkward string spacing, awkward hand placement (like pickup covers and little space to rest your thumb). Anything else? Thanks guys REALLY appreciate your digging!