Atelier Z Baby Z-4J represent! Easiest playing bass I own. The knobs have been replaced with Sadowsky-style aluminium knobs (Guyker) since this picture was taken, just like Atelier Z uses now (the old ones were the stock Bartolini knobs). Otherwise it's still very much the same. I believe the Baby Z (or any Atelier Z with the KTS titanium rods in the neck for that matter) isn't actually made by Atelier Z themselves but by Fujigen Gakki. Either way, it's a fantastic bass!
Controls are neck volume - bridge volume (pull for passive) - stacked bass/treble (boost-only). It's quite a powerful EQ that can add a lot of oomph and a pleasant zingy top end, while still sounding very musical. A passive tone control would have been nice, but is not a must.
It has a slight neck dive, but nothing that a good strap can't counter.
I traded my 1981 Ibanez MC924 for it with a lefty friend of mine in the US, and I have zero regrets. The Atelier Z weighs about half as much as the MC924, and has a lovely narrow U-shaped neck that instantly felt familiar. The 17mm string spacing at the bridge took a little getting used to, but is not unlike some of the 5-strings I've owned so wasn't a huge switch. It's brilliant! If I ever find a lefty PJ version (with a reverse split coil) I don't think I could resist.