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I don’t think there is necessarily a compromise to quality anymore. As in case of Sony (and Fuji), the same APS-C sensor as DSLR and DSLT is being used. For example, the 16 MP sensor used in Sony NEX-5N is also used in Sony DSLR-A580, Sony DSLT-A55 and Nikon DSLR-D7000. And with lenses, these mounts pretty much open the world of options.
The primary limitation of these mirror-less cameras is in sports/action photography since they primarily rely on contrast detect AF system which is not as bad as the CDAF (in Live View mode) of DSLRs, but not fast enough for continuous focusing. It may be a few years before on-sensor phase detect AF system matures to match mirror-based systems. However, this issue has been addressed in Sony NEX via an adapter. With it, the camera’s native AF system is overridden and converted to full time continuous AF system of Sony DSLT cameras. It does add to the size and weight, but the combination is still smaller and lighter than DSLRs (and even DSLTs) and need to be carried only when action/sports photography is the idea.
Check this out:
Sony NEX-3N: 269g
Sony 10-18/4 OSS: 225g
Sony 20/2.8 Pancake: 69g
Sony 35/1.8 OSS: 155g
Total weight (camera body with three lenses): 718g
Sony DSLR-A580: 700g (and that is just the body). And I can literally carry the NEX-3N with a lens, with the other two lenses in a pocket or two of my cargo pants. If one prefers zoom over carrying 20mm and 35mm lenses, there’s 16-50mm PZ OSS Pancake lens (114 g).
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