GUI: This is the worst part of the plugin for me. The GUI is severely dated, and while functional, it still looks horrendous. I wish they could revamp it. Biggest letdown for me. It is custimizable though, so that pulls makes it a bit better.
Features: First of all, the monitoring on this things is great. It's very useful. It uses five different scales, and you can create more if you wish. It has RMS, multipeak, crest factor and more. Also measures dynamic range. And everything is bright colors! It also has another trick up it's sleeve: advanced side chain control. You can control this with all parameters, as well as MIDI CC input. Very useful! It does "stereoness", as they call it, and can measure phase cancellation. Again, very useful.
Stability: I've had no problems with this ever crashing. Super stable, like all other Blue Cat plugins.
Price: 59 euros for the metering alone would be a bit much for me, but when consider add the advanced side-chaining controls and phase cancellation measurement, it's definetely worth the price.
Conclusion: Even though the GUI is a bit of a drag, all the useful features and the low price makes this a must-have for anyone who wants something extra in terms of monitoring, side-chain control and phase cancellation measurement.