i went from a MIA 83 Jazz to a 04 Proline Vette 4..
the first few months with it were a real pain.. i developed tendonitis in my fretting wrist/hand.. i had to rest (stop playing it) and rethink my technique.. although they are both 34", the neck on the Warwick is shifted to the left (i'm right handed) and the first fret is a longer reach for me if the body is positioned in the same spot as the Jazz was.. i had to shorten my strap, purposefully shift the body farther back to get the 1 fret in a similar position as the Jazz was.. and had to rethink wrist position when playing..
i literally had to conform to the Warwick.. i didn't want to get rid of it, due to the tone.. but, it was one of the worse cases of playing tendonitis i've had, ever..
now, that i understand how to play this bass and not hurt myself in the process, it's effortless in playing.. it's become my first choice..
for some people, i can fully understand the issues involved with playing Warwicks.. the U shaped necks were just laughably huge and unwieldy for me.. if i had one, i'd have to shave the neck down to a more comfortable shape.. but for some, they are comfortable and perfect..
it's like shoes.. not all feet are comfortable in any one style of shoe.. understanding that, not all neck profiles will suit all hands.. you really must spend some time with a particular Warwick to really know if you're going to enjoy it, or not..
i like mine, but it was painful at first..