I have owned a regular 4003 (bought one new from the UK in 2009 when the British Pound was at a record low) but if I ever buy a Rickenbacker again it's going to be a 4003S. The rounded edges look so much more comfortable than my 4003 was, and I actually much prefer the plain look
. My 4003 was probably the second-least ergonomic bass I've ever owned, only surpassed by the Italia Torino semi-hollowbody I owned (big, wide body with sharp edges. Round back which made it want to dive forward on a strap. Not towards the headstock, but away from me).
I'm also really loving the new Rickenbacker bridge! Adjustability looks great, and it looks very solid. The tailpiece with the loose bridge that just rested on two small Allen bolts always felt wobbly to me, and would move around when I tuned my bass