I wanted to give something back after installing Gutsy, so here is my first post.
My history: I tried installing Linux in the late 90's, but became frustrated and reverted to Windows 98(!) In 2006 I read about how horrible and expensive Vista was going to be, and found Ubuntu. After triple-booting XP, Vista beta and Dapper Ubuntu, it was the latter that I found myself using most often (especially as my free Windows virus-checker subs ran out, and you guessed it, I'm too cheap to buy a new one). Dapper took a lot of CLI configuration, especially for video (as I wanted TV output from an ATI card, along with XGL/Compiz), printing and wireless networking. But I got it done thanks mostly to the fine people on these forums!
System: ShuttleXPC/Athlon 64 3400+/ATI Radeon 9600 Pro 256MB/1G RAM/160GB EIDE/16x Lite-On DVD-RW/Creative Soundblaster/Canon MP130 printer/Zonet ZEW2500P wireless usb/triple boot with XP+Vista
On to the Gutsy upgrade questions:
Did it worked flawlessly ?
It depends what you think is a flaw. I clean-installed 7.10 from LiveCD over a previous ext3 partition with Edgy.
The first few tries the installer got stuck at 46% "scanning disks" in the Partitioner, until I figured out that I needed to switch off my USB printer (Canon MP130) during the install process. After that, very smooth.
Did you got problems ?
Yes - above problem with USB printer preventing install.
My USB wireless didn't work out of the box, despite the promise on the wiki (Zonet ZEW2500p with ralink 2570 chip). I'm now reverted to ndiswrapper, and I had to blacklist the rt2500usb driver manually to get that to connect.
My next complaint is a strange one. Given the number of commands that I had to use at the terminal for Edgy last time, I spend ages before reintalling in collecting files for offline use about every aspect of my hardware. However, Gutsy is so good that I didn't need any of them, so my time was wasted by Gutsy being too good In particular, the printing, samba shares, connection of my Creative Zen player, and video/compiz setup were amazingly good in Gutsy.
Big props to everyone involved in making this. Outstanding effort.