Aero Glass works better on light surfaces. Dark fonts on the title bars do not show well on dark desktop backgrounds. I have a darkish desktop background. I run Aero Glass purely because I can.
The sidebar is more interesting. The clock has less functions than Win 3.1 clock had. The contacts book doesn’t auto update when an entry is put into it. The calendar is ok for me as I can rarely remember what day it is. RSS feeds I look at from time to time. The yellow notes are well worth keeping the sidebar running. Other gadgets have little appeal to me. So, I have four elements running, and space for a fifth. For now, I use the area to keep a small WordPad window open, useful for pasting info from web pages for later perusal.
I make no apologies for not being enthused about either.