Thank you for the comments everyone.
Last night I used them for the first time in-game. The first thing I noticed was the stunning clarity - I was actually hearing very subtle "environmental" sounds that had previously been inaudible.
The directional sounds are absolutely amazing. I tried out various audio modes, but wowzer, when I engaged Dolby 7.1 "surround" it really brought things to life. My character could clearly gauge from which direction a foe (or friendly NPC) happened to be approaching.... and, stupid though it will sound, I automatically turned my head a few times, when a voice seemed to be right here in the room, behind me! Lol
(A note. I wasn't going to choose the Dolby "virtual surround" headset (363D) because some reviewers had seemed a bit unimpressed. However, my OH was very insistent that I should get them, particularly after several other reviews mentioned how good music sounded. So, as I will be using the headset for both gaming and music purposes.... I was persuaded.)
Regarding voice: there was a huge difference in sound quality. There must have been around 10 of us on TS last night, and everyone came through very clearly. I wasn't deafened, when someone coughed or shouted with excitement, into their mic... in fact, the audio balance was unbelievably good. A few people also remarked that I sounded very clear too... (I did not tell them what I was using, merely saying it was a
different headset, and to please let me know if there were any problems; we are well enough acquainted now, to be helpful/truthful with each other.)
At the end of the game session, my ears were still feeling comfortable, cool and best of all, not "fatigued" sore, or ringing.
TLDR...? I am a truly happy bunny! (Hope you are too V_R)