[Gunner]

The only thing to watch for is that some higher-power CFLs do not like being operated base-up, or even base-sideways for some models. These are typically the 120-200W equivalents. There are also cautions about running these bigger lamps in completely enclosed fixtures.

If you're going to use anything bigger than a 100W equivalent, read the package carefully to see about limitations.

But you're right, yes, in general that all that matters is the actual current draw of the lamp. Since CFLs are all a fraction of the power usage of their incandescent equivalents, it's a non-issue. If a lamp has a size warning on it, you can pretty much ignore the warning unless you are going to put a big honkin' CFL in a small fixture. Those warnings refer (usually) to the heat generated by the standard bulbs, and even big CFLs only generate a fraction of that heat in their base.