Do you think it has improved your game?
Oh yes indeed, it's main benifits include
Simple things like being able to graphically re-run a hand you have played which makes it much easier to think about than if you are just reading a hand history from a page. Pot odds are available at the touch of a button.
Compile statistics on your opponents that you can superimpose onto the screen you are playing at the moment using companion programmes such as gametime+
See how you do in various positions with various hands. If you are losing money in the small blind for example this will show you in black and white.
Loads more.
I think the tool is most useful for the limit poker player, however big bet and tournament players can also get loads of mileage from it.
It was invaluable for me helping me move from playing a 50c/$1 limit to 8-tabling $15/$30. Focusing on tournaments now and must confess don't use it as much.