I have one of these preamps. They sound MUCH better than the Juiced Link. The only con, and it's a big con, is that it's difficult to mount onto the camera. 

The Sony CLM-V55 Monitor features:Push-wheel for independent screen controls.Headphone jack for live audio monitoring.Brightness, contrast, and colour temperature controls.Peaking feature.800 × 460 dot resolution.1x magnifier for fine focusing.Aspect ratio adjustment.Dedicated hot shoe mount.Sun shade.Powered by a standard Sony Alpha battery.Can be used with other Sony cameras.<br />
Available February / March for around $399.