I installed Speccy for the first time and I must say I am impressed to see how much info it can come up with. But I think the GUI can be improved:
1. As mentioned in post #3 in this thread
http://forum.piriform.com/index.php?showtopic=25251
the color scheme can be dramatically improved.
2. I think the blue arrows, which can be clicked to expand an item, must be (somewhat) larger. Currently it's relatively hard to correctly postion the mouse cursor. Changing the colors would also help to see where the user needs to position the mouse cursor.
3. I think that, if the navigation menu is displayed, the user should see which category he/she has selected. So, the category could - IMO - be highlighted, underlined or perhaps displayed in bold characters.