I haven't been very fond of Creative Labs soundcards here, in general, for a couple of reasons. First is the obnoxiously large software load the driver and installation disk wants to inflict on your computer -- irritating popup splash screens, overly complicated configuration panels, and lots of tossed-in applications. Some of the applications may be interesting to those using the soundcards for games (at least for a few minutes before the novelty wears off), but they are seldom worth the disk space or the extra Windows startup time. The installation also puts icons on your screen, and whenever driver updates are performed, all your settings get changed (and any icons you cleaned out get put back in).
My second gripe is with the sample rate conversion scheme that Creative Labs cards use when recording. The cards internally sample at 48kHz (or 96kHz in the newer Audigy 2 cards). For lower sample rates they use a conversion scheme that appears to skip enough scattered samples to get the rate down to the desired amount. This is not very clean, and makes it impossible to time synchronize to the extent needed for measurements (such as with MLS) at these simulated sample rates. So you mostly have to use the card at its actual pure internal sample rate or at an even sub-multiple of that rate, if you want to use PRAXIS' synchronous modes. That's really not much of a restriction, though, as 48kHz or 96kHz are pretty much the only rates most PRAXIS users use, at least, anyway. But it is another complication and something to have to remember (and it also seems to be a chintzy way of providing multiple sample rates, particularly for something priced like a premium soundcard).
Another concern with Creative Labs cards is that they have been known to market distinctly different types of hardware under the same model name.