Subspace is a beautiful place to be, but also possibly a bit scary for newbies, or persons that lack adequate trust towards their partner. As my wife wrote before, it is a great training tool, too. This might seem weird from perspective of a submissive, but I am very much aware of the changes I went thru, and still going.
Speaking from past times, each of our session, she'd gradually put me at "my place" (subspace), and slowly intensify it until I would reach it so deep, that it actually had this intensely hypnothizing effect. At that point, there is nothing I would say no to, she could to to me or with me or request anything from me, and I would say yes. But in the past, once the session would end, and I'd gain my senses back, we'd both just return to our vanilla routines and remain there until the next session. In time, sessions became more often and lasted longer, and I felt like I was constantly within some kind of subspace.
Today, I think that I cannot really return to ordinary and vanilla state of mind. Regardless to how long and intense sessions are, in between them, I am constantly in state of readiness to serve in any way possible, meaning I never actually leave the subspace completely.
That is why subspace is such effective training tool, nothing like it.
Mark