Ok, but not worth $14

I bought this because of everyones glowing reviews, but I was a little disappointed.

I use multiple monitors, and I switch my windows between monitors all day. I really only needed this tool to do 1 thing, be able to split windows into 50% left and right, and to full screen the window (as in full width). Should be pretty simple for a tool like this except when switching between windows on different monitors it constantly gets the resize wrong and I find I need to move and Shift+Click the green maximize button to fix it, which kind of defeats the purpose of this tool.

For example, I have a browser open on my 30" monitor, I press my hot key for full screen and it works fine. I move the window down onto my 13" retina display and press the same hot key and it now sizes the window about 200px too big to fit and I lose my tool bar and have to manually resize the window.
Now Iv just introduced a second step into my window resizing process that wasnt there before. In the end, I just end up doing it my self manually.

Sometimes it does this, sometimes it doesnt. I cant figure out why. If Im only using 1 monitor, then the problem goes away. So obviously the switch between retina and non-retina is less than perfect.

Bit annoyed I spent $14

SoundPunk.com about Divvy - Window Manager