There's a huge range of Atom processors. Some are 32-bit only single- core, there are models which are 64-bit capable and multi-core. There are a wide range of clock speeds, cache sizes, and bus speeds.
I know, I was mainly looking for general opinion about support and performance. IIRC, back in ~08-09 when Atoms first came out there used to be issues with maybe DMA or something that caused some models to be way slower than specs would indicate, and I was wondering if that was mostly a thing of the past, or if ACPI/64bit/MP/whatever doesn't work right on certain model lines or something. Or basically any issue software or hardware that would make some models not be able to handle high traffic.