GUI: Good-looking if you ask me. Not as good-looking as its fiercest competitor, the Fabfilter Pro-Q 2, but not bad at all. The knobs and the rest of the controls are sized well, which makes this a joy to use. No "fiddlyness" here, as some EQs sadly have. The GUi itself is very clean in a "no nonsense" kind of way, and more sterile than Pro-Q 2's more colorful style. I also wish that Equalize, like Pro-Q 2, had a fullscreen view, but that is just nitpicking.
Features: Nothing extraordinary here, but certainly powerful. It has 12 EQ bands, which should be enough for pretty much everything, The six usual filter types are present. The frequency, gain, slope, bandwidth and resonance can be adjusted for each band, and you can choose between three filter modes (minimum phase, linear phase, novel mixed phase). All this is being visualized in real-time in the neat spectrum analyzer. Another nifty feature is the optional automatic make-up gain. No complaints here.
Sound: Supports sample rates up to 96kHz. Does both mono and stereo, and mid/side/left/right/full can be adjusted for each band. Clean sound which does not color the sound in any way as far as I can tell.
Compatability: VST and AAX for Windows, VST, AU and AAX for OS X. Both 32-bit and 64-bit versions available. As expected from a commercial product.
Other: It, like their other product Verberate, has a large and good selection of factory presets, and you can save your own as well. A nice little extra.
Verdict: Quality equalizer with an intuitive GUI and all the features 99% of us would need. Add a wide range of compatability and a solid selection selection of factory presets, and you've got yourself a solid pick. 9/10 from me, and a worthy cheaper alternative to the Pro-Q 2 (10/10).
For more info and purchase links, check out the description right here and their webpage: http://acondigital.com/products/equalize/.