Personally, I'm somewhat upset at Sandisk for releasing a certain MP3 player, the Fuze+, which is notorious for a number of problems, most of which come from it's (overly bloated) firmware. Problems such as frequent crashing, extremely long music DB refreshes, a clock that doesn't always keep track of the time, and generally laggy menus. If Sandisk would just update their firmware, I have no doubt these issues could be corrected. But, considering the last firmware update was way back in 2011, I seriously doubt this will happen. Luckily there's Rockbox!
I guess there's more money the (hybrid)SSD market than the DAP martket.