Love it. Had a G1 Panny for a couple of years and when they came out with the A33/A55 with equal resolution EVF and phase detect auto focus, I had to have one so got an A33 and I got a A77 a few months ago right before they became generally available everywhere.
All your shots can be, as they say, chimped before you shoot. What you see is what you get. The EVF can be cranked up in darker conditions too. BIF are no problem, at least as far as the EVF, but there is a slight blackout between shots.
The A33 EVF was at least half again better than the pretty good EVF on the G1 and the A77 is so good, you really never notice it's an EVF. If you want to read more about the EVF and how good it is, got to Kirk Tuck's blog and he gushes a lot about the ability to chimp your shots and the speed and low ISO capability of the A77, as in 50 ISO.
Plus the focus peaking is a feature that I use a lot now mostly for DOF checking to see exactly where the sensors have focused on. That feature will be one of the greatest advantages of the EVF over an OVF.