Hi, actually I had one of the HardDrive players and currently have a Zune HD, both are robust players with excellent audio and build quality.
The Zune service is excellent, I actually signed up to the US one before it was avalable over here and that coupled with the excellent Zune PC software made for a great experience.
I have had a lot of MP3 players and have to say I prefer the HD over the other ones I had including my iPod touch, if your not that fussed about apps.
The Zune PC software is better IMO than iTunes on my Mac, so that in itself is a testament.
Such is the quality of the player and the software on it I have been slightly disappointed with the implemetation on my HD7, but its early days yet for WP7.
But as usual the MS haters knock it down without ever actually using the product, hope they keep the Zune streaming etc around.