I own a cheaper refractometer ($30 or so) and I find I still gravitate toward the hydrometer for my main readings (OG, FG). What I like the refractometer for is to check the quickies - like end of running gravity, preboil gravity, or a quick OG reading to ensure the boil really is done.
The main problem I have with the refractometer's readings is that it is inconsistent. Take a shot glass sized sample, put several drops on the refractometer and get a reading of say 10.2 Brix. Rinse the refractometer with distilled water, dry, apply another few drops from the same sample and get 10.6 Brix. Do it a third time and get 10.0. It's gotten to the point where I now take 5 readings per sample and average them. Sometimes 4 of the 5 are identical, sometimes every one is different. Another issue is the line is so hard to read, as it's not a distinct hard line, but a blurring of white to blue that happens over the span of say 0.4 Brix or so. I generally aim for the middle of this area to get my reading.
But when it comes down to it, there's nothing as precise as the hydrometer. I'll often find my hydrometer reading is a point or two off of my refractometer reading. When this happens I always trust the hydrometer.