Next to ParanoidAndroid, this is easily my favorite rom for the Nexus 7. It isn't too noticeably different from stock or even Cyanogenmod, but the additional speed and optimizations are pretty apparent after some use. Some small extra options here or there, but also consistently updated. The installer is even awesomely user friendly. Mine starts up from the Google logo in 44 seconds consistenty, never lags with any navigating or animations or apps. The battery might just feel incredibly better than usual.
The only leg up any other roms really have on this one is having a switchable tablet/phablet/phone UI. The one on this is abandoned or uses NOVA or something, which just isn't quite as integrated and didn't work well when I tried. So it would be amazing if you just had the real option available at some point, even if it was just a simple option in Settings.
Also, a small noticeable thing by comparison to PA, when you're switching apps and you push the clear all apps button; SmoothROM clears every single app, and PA clears every one except the current one and you can just double tap to clear them and then the last one. This feature can be useful, especially when you're used to it. Being able to switch that on/off would be a great option.
Those are just my immediate thoughts over the past weeks using this. Basically anyone wanting a simple, intuitive rom to get the most performance and juice out of your Nexus 7, this is pretty obvious.