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Now that’s interesting!
Does anyone have information on how iTunes 10 is with Flac? I prefer this lossless format over Apple’s own, and use Fluke for importing into iTunes. (Flac is not natively supported in iTunes.)

For me the dealmaker or dealbreaker is Flac performance.
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I haven't noticed any performance biz, honestly. I got 1.9 days of music and it feels the same. Hey, we should have a music contest… whoever has the longest music wins. :)

Is this the longest song title ever?

"The Black Hawk War, or, How to Demolish an Entire Civilization and Still Feel Good About Yourself in the Morning, or, We Apologize for the Inconvenience but You're Going to Have to Leave Now, or, 'I Have Fought the Big Knives and Will Continue to Fight Them Until They Are Off Our Lands!'"

From Sufjan Stevens "Illinoise".

I made the mistake of using the "Auto Size all columns" option in iTunes.

The longest title must be "Mother in Law" or "Eternity" :D

I've kept iTunes 9 on the iMac (despite the protests of software-update); not much difference. UI is more tolerable and colourful; it's only a little bit slower than iTunes 10 on the MBP. Mind you, the MBP is a faster machine anyway.

I took the plunge and installed v10. Performance wise on my iMac I haven't noticed much difference. I've pretty much adjusted to the new icons. The only change I don't like is I'm pretty sure I used to be able to right-click an image in cover flow and select "Get Album Artwork" from a pop up menu. Now I have to select the tracks in the list view below the covers and select the option from there or from the advanced menu which is even more painful because my iTunes is on a second monitor.

At least you can get artwork from iTunes directly. I had to install some third-party freeware to get my artwork and lyrics.

Yeah it's great when it works, frustrating when it doesn't. Like when it pulls the wrong artwork, or you have to rename an album to get it to match up. I wish there was a search or browse option for the artwork for those occasions when things don't go to plan.

iTunes Artwork Assistant searches Google Images for artwork, presents you with choice so you can install it. More flexibility

I just upgraded to iTunes 9 about two months ago, and was very happy with it. Apple forced me to get iTunes 10 in order to sync my new iPod Shuffle, and I'm really not happy about that. They should have made a downloadable module to support new iPods in iTunes 9. Anyway, here are some of my first impressions of 10 after one evening of use.

iTunes 10 feels faster on my PowerBook. I like that.

New grey icons: I love them.

New iTunes icon: Inevitable and smart move away from the CD image. I would have preferred green, or orange, but I like it better than the previous / original icon.

New look for the list field (font, anti-aliasing, checkboxes): Don't like it.

New treatment of the column headers: Very nice, I dig it.

"Plays" and "Skips" instead of "Play Count" and "Skip Count": Please revert back.

Ping and Genius: Never use them. Not sure if I ever will.

My biggest complaint, thus far, is that I can no longer drag to re-size the album artwork in the list field. That was probably my favorite feature in 9, and now it's gone! The three selectable sizes just don't work for me. Also, I liked pressing Command+G to show or hide artwork. That feature didn't need an additional button added next to the HUD.

Second biggest complaint: It requires 10.5, or later, which means that Tiger users must update their OS if they plan to buy and use a new iPod. That includes the 4th generation Shuffle. That requirement bothers me… a lot.

Why don't you want to update your OS? Leopard was released almost 4 1/2 years ago. Tiger is 6 1/2 years old!

Tiger runs faster on older hardware… like those ancient G4s.

I still keep a fully maintained Tiger partition on my PowerBook because its G4 processor can't handle certain apps when in Leopard.

I'll also say that being forced to find, then download, and then install a new version of iTunes, and trying to get used to its massive UI overhaul, all while trying to learn how to use a new iPod, is just too much to handle all at once.

Most people, as I understand it, just want to buy it, plug it in, sync some songs, and go. I'm pretty good with Macs, applications, and the like, and it took me longer than it should have to get a few songs onto my Shuffle, mostly because I had to mess around with installing and then exploring iTunes 10.

I don't like the modality of iTunes. You're locked into preferences and info. That's maybe the worst.