I am working on a rather large DB based project and I like the look of several tools .

Looking through the related downloads I found out about GDR R2 , I can't seem to find out that much information about it - not even sure what the GDR is worth, but one thing that caught my attention is

"This release includes many previously released Power Tools, as well as several new features.

It also says in the installation section -

" Uninstall tools for Database Edition tools if installed."

So,

• Does it contain all of them and a few additional features, or just a few?
• What does GDR !?
• Should I use it over standard power tools?

Edit -

Paul Baker's answer is great and answered 2 and also gave me a lot of information, but I'm still unclear what 1 and 2 are about. Does anyone know?