There are weaknesses here: while there’s a USB input, it’s my understanding that music can’t be played from a USB drive. Any files also first have to be transferred to the HAP-S1’s internal 500GB harddrive in order to be played; there is no option to stream from another device, which strikes me as limiting. It’s also my understanding that it’s not compatible with popular streaming services like Pandora (although it does offer vTuner for internet radio streaming), which probably isn’t a huge deal for the majority of folks who are looking for a high res player, but it does limit its use somewhat as a household all-rounder.
Otherwise, it’s that ability to be something of a plug-and-play all-in-one unit that makes this really appealing. I don’t think an audiophile who wants an easy solution to computer audio is going to be disappointed with this purchase, but I think where it really shines is as an option for a music lover who wants to be able to move beyond a pocket device and bring high res digital music into their home easily and with a minimum of fuss: just add speakers, and you’re good to go.