A year or two ago, I bought the SXFI Amp for the purpose of using my IEMS with my desktop. Indeed, it requires a mobile phone to correctly set up the device (with SXFI etc). However, it works just fine with a desktop, albeit lacking dedicated software to tweak sound settings in the desktop environment (e.g., Soundblaster), which I knew before I bought the SXFI Amp.
In fact, I
asked around at the time to understand if the (well received) G6 would soon get a revamp to offer IEM users like myself a solid IEM Dac with gaming features (e.g., mic support and equalizer settings), as the X3 (and later: the X4 and the GC7) clearly do not tick all the boxes for IEM desktop gamers. Because no such perfect Dac existed, I looked at various dongles (lacking gaming features) instead, soon arriving at the SXFI Amp because it was relatively cheap and offered mic support. Besides, I was interested in trying out SXFI, which in my opinion is a fun setting to play around with (although difficult to set up well, as making pictures of your own ears and face consistently yields mixed/varying results).
After purchasing the SXFI Amp, I learned that you don't need Soundblaster software to tweak equalizer settings etc, as much more powerful (as well as less buggy and demanding) software can be downloaded freely from the internet (which I did, using Peace Equalizer now). This requires some time to install and set up according to your preferences (which is what equalizers are about anyway). The only thing missing is a proper Gain setting, because my windows volume is always at 14 and I don't ever want it to be higher, and I wonder if the Soundblaster software offers a Gain setting or anything to max out the volume at certain parameters.
Bottom line is that I am not disappointed with the SXFI Amp for desktop IEM use. I already took the time to install and set up superior free alternatives to Soundblaster, so the lack of Soundblaster software is irrelevant for me (although I'd like to have a proper Gain setting). However, I would have appreciated that Creative offered the same support for the SXFI Amp, which is identical to the X1, also from a matter of principe and fair and transparant marketing. I think, in the long run, it would benefit Creative more to say that they've increased support for an already existing (great) device instead of faking the existence of a completely new device (quod non), harming its reputation.