I purchased the Z80 on the first day of introduction and here are some of my opinions.
So far I haven't down-loaded music, only ripped my Cd's (lossless)-(some one recommended I do it that way) Sounds great, not as good as My HT setups but good enough for a portable in my situation.
I have cheap HP's (6)
80's-OK sound for included Stock better than my friends stock Ipod buds (Is that the right word?)
At work every one is trying to get there hands on my Zune it's like (to them) the first time they had sex when they get to checking out the neat features and functionality of my Z80 (It's full of WOW factor)
Senn HD 450 (old) very nice nice sound but at 300 ohms I have to crank zune to 18-20 to get them working (This is why the question concerning the Bennie's of a portable amp up above)
Cheap Sony MDR-W14 fair-almost good sound but convenient & easy to grab quickly and slap on for a few minutes of listening for a short free time (Work/Boss..

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Other old Sony Walkman type HPs below average sound.
Goldring DR 150..I have only listened to them for an hour, I'll keep my opinion on these for later because, I did the dust cover mod on Monday and immediately decide to try the break-in theory I read about here, so they are getting fed music 24/7 until this coming Monday for the 200 hr break-in (



) I don't know if this theory works or not, but I'm kinda of new to using HP's & this is my first MP3 player, but not speakers, amplifiers, Pre's, etc..I don't believe that speakers need break-in (just my opinion) Please no flames..

I am very impressed with the radio, some of the stations sound as good if not better than my recorded music...Great feature for News, Sports and a break from your collection.
My Ipod friends have been 100% in agreement of wanting a radio included.
Pod cast..Man I've been missing out for however long they have been around...I really love this feature and simplicity of subscribing to them at the Zune site..Once again another break from just the music collection.
Finally I have converted many DVD's (Concerts & Movies) for long down times and although the screen is small it's good for viewing and another choice to the music collection...After I view a movie I delete it to free up space for more additions.
OK, The title of this thread is: 'So how do you like the Zune 80?'
I like it VERY much and for my situation it is almost the perfect Time killer (when you have free time to kill)
Cons:
So far battery is less than advertised and I guess that MIGHT be because I use large music files????
I'm guessing about 3.5-4.5 hrs on full brightness of movie watching.
I watched maybe 30 pod-casts and listened couple of hrs of recorded music + showing my fellow employees some of the funny pod-casts approximately 1 hour of that and the battery still showed about 40%.
I have not done a detailed test of just how long it will last but you get the idea, Less than advertised as with just about everything.
No clock...Yes a clock would be very nice because when your playing with it you tend to lose track of time and well it would be convenient to have it...Yes I have a watch & cellphone, a clock would make a lot sense.
Accessories are expensive (cases, extra sync cables, docks, etc...)
Manual...lame is all I have to say about that.
Screen resolution should have been increased with the added screen size (ipod is same with a 2.5 screen vs 3.2 for zune.

)
I'm not a gamer but the ipod gang brags about that,,,So I guess that might be fun.
Overall this is a great featured packed MP3 player...IMO
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Now I just have to lock onto the right HP's..

LQQK