I have used Plinius 9100 with my S5e for 4 years with excellent results. Good soundstage, good base, very linear. My listening is mostly jazz, classical, voice.
I also tried my Plinius 8200 MKII, but I could see very little difference. I use Audio Magic bulk silver coated #10 speaker cables.
I am upgrading to Spendor A6 next month and will continue to use the Plinius 9100. Thinking of switching to Plinius 9200 if I see one on A'gon. Will switch cables to Kimber 8TC to see if any improvement.
Have tried many amps...have found Plinius Int'd amps perfect for my needs.