Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Arch linux is a rolling release distribution that provides bleeding edge software. That is all to it. Now, with bleeding edge software, there are always stability issues. If you are looking for rock-solid stability, go for Debian without any further thought. However, do consider the fact that if software is bleeding edge then most likely the bugs are upstream than with the distribution. This notion is reinforced by the fact that Arch does not mod packages. Arch branding is optional. When I started using Arch, I had reported a firefox issue which turned out to be an upstream problem. This was within 24 hours. Then there was the valgrind issue which I did talk about at length. So, basically Arch people respond fast. However, the IRC channel #archlinux is not very friendly (may be I still have a hang over from #gentoo). Arch is good at performance; boots up fast. It has decent support for hardware. Installing drivers for my WLAN was not at all difficult.
On the downside, some aspects that are not addressed by upstream properly are not handled by Arch.