It looks pretty good to me. Even the Aero GUI is decent, IMO.
As it's downloading, it would be nice if there were some type of interactive indication that would inform the user of progress, All I see is a "not responding" window even though I know the program is actually working properly (most users will wonder):
A few other quick observations, if I may:
The program didn't seem to remember I had already downloaded Opera, left the "Download" button respective to it enabled, and gave me this message when I clicked on the "Download" button for Opera:
Here it shows I have downloaded FF, Chrome, and Opera, as it should, and you can see I have chosen to save the installers:
However, upon, reopening the program, even though the installers are still saved:
the program sees only the FF and Chrome installers that were previously downloaded but misses the Opera download (as mentioned earlier) and neither does it retain the "Keep Installers" option that I selected previously:
If I were to exit the program without re-checking the "Keep Installers," the installers I downloaded would be deleted whereas I might not desire having such done.
An option for the installer location and storage would be nice as well.
All-in-all, it's a pretty cool program for those of us that like to play around with varying browsers.
Thanks for taking the time to hear (read) my humble opinions and thanks for putting the effort into creating this utility.