Yeah I would not consider Quest Spotlight a "monitoring" tool.
Meaning you can't go home and have Spotlight warn/alert you about free space...or locks.
It is for "active monitoring"...active diagnostics much in the way a DBA would actively (not constantly) query v$session, etc.
It puts "face" on the Oracle database.
Spotlight does a great job of pointing you in the right direction when you already know *something* is wrong...not telling you something is wrong ahead of time.
Spotlight is to much of a client PC hog to run it for more than several databases for a log time.
Regarding "face"...the GUI itself. I have not seen the 10g "Dashboard", but I have a hard time, based on past experience believing that OEM has a better, more intuitive, and compete GUI than OEM. Am I wrong?...is OEM 10g GUI that good...that changed.
I did hear the Oracle hired away many Quest Developers?