I've tried quite a few GNU/Linux Distributions in the past, everything from Arch Linux to Sabayon Linux. I've liked quite a few of them. My first distro was Redhat Linux 5.2 which I had running on my AMD 486 DX4-100Mhz machine when everyone had Pentium 2's. Since then a lot of things have changed in the GNU/Linux environment. Compare Redhat 5.2 to Windows 98, and then compare Redhat 5.2 to Fedora 12. You can't claim so much has changed from Windows 98 to Windows 7.
I've used OpenSUSE so long ago I still remember calling it SuSE. I had tried it when version 5.3 came out on 5 CD's (and more for source). I had also tried the professional versions of 8 and 9 which I thought were pretty decent. I eventually grew tired of the old software not being kept up to date with Upstream. I switched to Gentoo, then Ubuntu and then to Fedora when version 11 was released.