Been testing the Fuze+ and Clip+ as my S9 was in the repair shop. Wasn't expecting much as I had a taste of the Sansa sound signature earlier with the Fuze V1 for a brief period. The SQ coming out of the tiny Clip+ was a pleasant surprise. Using the original firmware (01.02.15) with the Rock preset and A/B testing FLACs against the S9 (BBE Viva and Maestro), the Clip+ has a fun and engaging sound with plenty of low end and good detail. Very clean HO and hiss free. The soundstage is a tad narrower and less airy than the S9. I would categorize the Clip+ as a warmer-darker player and favor its pairing with the cooler-clearer, bass-light CK10 than the warmer-lush sounding SE535.
As for the Fuze+, the sound signature is similar to the Clip+ though the latter has better bass impact and extension. In the beginning of The Black Eyed Peas' Boom Boom Pow, the L-R reverb, decay lasts around 0:58 on the Fuze+, 1:03 on the Clip+, and 1:04 on the S9. Build quality of the Fuze+ is a disappointment from the first gen with thin plastics, creaky casing, fingerprint-magnet finish, temperamental touchpad, and poor UI. I wear my IEMs over the ear with the cable hanging down my back and the player in my rear pocket. The most annoying thing about the Fuze+ is that even if you lock / hold the touchpad, it has a tendency to turn on by itself due to the friction of the touchpad rubbing against your butt. The engineers should have designed a physical hold switch on the top or sides of the player.
Not that the Clip+ has amazing build quality as it still creaks, but the tactile control buttons are a DAP prerequisite for blind control in my books. In terms of improvements, would like to see the next version incorporate thicker plastics in a matte finish or a brushed aluminum faceplate, sweat-proof by sealing edges, buttons and ports, and a thicker, longer removable clip to accommodate larger belts. Battery life could also be improved. Overall, the Clip+ is a decent workout player and for critical listening, the Cowon remains my go-to player.