I can't answer for others, but I upsampled everything to DSD128 with my Big7 and now DSD256 with the Golden Gate.
In my system, upsampling to higher level DSD with HQPlayer just sounds more real on the Big7 and GG...plain and simple. With JRiver upsampling to DSD sounds better to me than original PCM, but not as dramatically so. It is also nice not to have to switch between DSD and PCM modes in your Lampy while you explore your music.