Well, I guess change is hard for some folks. Personally I generally like change in the tech world because things are improving. I'd say I'm very happy with about 90% of the iOS 5 changes on my iPad.
I am in full agreement that the original iPod App was better than the new Music App that replaced it. That may be because I haven't mastered the Music App just yet, but after a couple of initial test drives of the new UI, I liked the iPod App better.
After the iOS 5 upgrade I found the Music App had some serious bugs. I'd touch one song and a different song played or worse, nothing would happen. It was also slow to respond. There was some album art missing as well. These things really concerned me. Here's what I did to resolve everything. I connected the iPad to my computer and in iTunes under "Music" I unchecked "Sync Music". I clicked on "Apply". This removed all of the music/playlists that I had on my iPad. I then disconnected my iPad and shut down iTunes. I then reconnected it and re-checked "Sync Music", putting all of the music back on my iPad (with about 30GB of music this took a little while of course). Everything worked as expected except the response time was still slow. I decided to reset the iPad. Held the home and power buttons for at least ten seconds, until the Apple logo appeared. Ta-dah! My Music App is as snappy as the iPod App was and everything's working flawlessly. Phew!
Should I have had to go through that? I don't think so...that's not my normal "it just works" Apple experience at all. However I'll cut them some slack...this time. As compared to Windows updates and upgrades of years past, finding drivers, tweaking the registry, putting up with massive updates that made my PC's slower and slower, crashing on a regular basis, no...still not a snow ball's chance I'd ever go back.
Still don't like the Music App UI as much, but I'll give it some time.
Other than that iOS 5 is working wonderfully on my iPad and iPhone 4 as well as iTunes 10.5 and Lion our Macs so I couldn't be happier with this upgrade. I feel badly for folks that don't like "change" but as for me...I enjoy learning new things, it keeps me young and I don't shout at the kids to get off of my lawn nearly as often!
