NEX as a DSLR Replacement

At first: Image quality is par with SLRs and SLTs since they have the same sensors.

NEX cameras have advantage in size and weight. One can carry them in normal bags whereas SLRs need much more volume and weight.

SLRs and SLTs have advantages with in camera stabilization (depending on camera make) and working with long lenses.

So I have now both of them. Sometimes I use them both, the NEX for 'normal' shots, and the SLT for tele and macro work. So I need not take a mediocre travel zoom because changing cameras is much faster than changing lenses. And when I need light weight I take the NEX.