Problogger Abe Olandres of Yugatech has reviewed the Zune8 in his blog.
He writes:
"Having had several mp3 players (an iPod Video 30GB, a Nano, an iPod Touch and a Red Zune) for sometime now, I find myself using the Zune more often than the others. Let me share with you some things about the Microsoft Zune and why I think it’s a good replacement for the venerable Apple iPod."
From someone who has owned 3 iPod devices, this review is proof that once you use a zune, you'll never bother to use your iPod again... (not really never, just lesser)