No offense, but it feels junky, just like most web stuff that's trying to do "real" application UI.

Here's some of the problems:

- You can accidentally "select" the text of the buttons

- changing the style of the text causes selection to flicker

- clicking outside a paragraph area causes the selection to flicker (instead of moving the cursor)

- many of the menus don't collapse automatically and they overlap each other

- the site layout just breaks when the page width is too narrow (may be more of a website problem)

All of these are very common problems with web technology, working around them makes the difference between "good" and "acceptable".