LCD viewfinders have had some major disadvantages for demanding photographers including:<p>* low resolution<p>* low responsiveness<p>* poor colour and lighting<p>* drains battery<p>I've tried some high-end LCD viewfinder cameras a few years back, but none felt as snappy as a DSLR.  I haven't tried out any of these EVIL cameras, but I would guess that there have been improvements in these areas in recent years.