Im trying to be as legal as possible so I used a 30 day trial of Vista because I don't own a copy. Let's begin!
Windows Vista SP2 actually is even more beautiful than Windows 7 SP1 and at first glance you can't notice any difference. But they start right from the beggining: drivers.
While 7 was able to find every driver in my 2009 laptop, Vista was unable to find 8 drivers! Not a real problem for me because I have awesome programs for drivers search and I was able to find 7 out of 8 and upgrade 22. The last was the wireless. I searched manually through the internet (with cable) to find it. I found after hours of searching that Vista is ALMOST forgotten from the manufactors. Anyway I found a driver from 2009 (one of the first ever released for this wirelesss card) for Vista and I installed it. Thanksfully no further problems occured.
Now, Vista is a little more resource hungry than 7, at some point is faster, at some not. The world wide opinion about that "Windows 7 is Vista SP3" is correct! Vista also preserves some functions which I like while 7 remove them or lock them (you are unable to remove the desktop shortcut on the taskbar in 7, in Vista you can).
Another not so good news about Vista is the support for everything! While XP is disappearing, Vista is following it closely. I don't know why everybody hate it... The issues at the start are dead from a long time.
In the end: My opinion about Vista is positive, only thing which I don't like are the support dropping and the lack of drivers for it.
Thanks for reading.