Hello, I have the Sparkler S515 and could not be more satisfied with the operation and sound. I chose the integrated player as it incorporates their latest D/A processor.
I use this with Sparkler's S501 headphone(pre) amp and HiFiMan Arya headphones. The sound is fantastic - very neutral, no noise, great imaging, and no digital glare. It's lively without being warm or bright.
I believe it represents great value, and I really like the aesthetic. Note: the player does have a small power unit that sits beside or behind the player.