Spectacle's default keybindings conflict with (override) Chrome's primary next-tab/previous-tab keys, but there's an alternate command+shift+[ or ] binding for those actions in Chrome.
https://www.irradiatedsoftware.com/store/index.php?app=SizeU...
On top of that, I use shortcat to add keyboard shortcuts for all (ahem, most) GUI interaction.
Using the gesture to hold two fullscreen windows visibly at once but not relying on tiling or overlapping is surprisingly useful and productive.
Spectacle and ShiftIt are two alternatives I later heard about, but haven't yet tried, so please let me know if you try them out and find a clear advantage to either (besides price).