RE: Hirobo SRB Quark
No, the Quark will auto-stabilize too, just like the mSR. I don't have an SR120, but if it's anything like the mSR then you probably won't like the Quark.
But, the Quark has adjustments in the head, flybar/stabilizer and on the control unit to lessen the auto-stabilize effects. You can't get rid of them 100%, so it won't fly like a true CP, but you can minimize them.
It will do like you said, when you release the elevator stick it will return to horizontal. But it can really move and when the tail is working properly it is a real joy to fly. Outside it really needs to be a windless day or it will rise up like a kite. But inside is where it really shines as you can practice (in no wind) and get your tail-in and nose-in orientations down without the threat of damaging furniture/lamps/the heli due to the low 1800-2000 RPM head speed and the foam blades.
-John