Indeed, a heck of a phone and I'm sure your girlfriend is enjoying it!
The X is more of a fanatics phone I think myself with the extra features.
But I love them both!
The One X is much better obviously lol and when i have a spare £480 i will no doubt be buying one and when my upgrade is due next may, if the top of the range htc product is anything like these two now I will no doubt be getting a htc.
a few reasons she got the one s over the x
1)she finds the one X a bit too big for her
2)you only get the beats headsets in the uk via vodafone (so i have been told anyway and its the first 10,000 customers for each for the one x white, one x grey and one s grey, so first 30,000 customers). I know many say the beats audio is just a gimmick or the headsets are just a gimmick but actually they are fantastic imo i was using them on my sxs last night and they boost the sound straight away and dont get me started on what they sound like on the one x and one s, its just mind blowing.
for those of you who know about the power amp music player in play store(market) download it to your one s or one x and unlike the sensation xe/xl where power amp didnt work and you just had beats audio on or off as eqaulizers on the one series you have other presets aswell and power amp works with the beats audio preset and omfg you think the standard music player sounds good with beats audio try using power amp with beats audio it is the best music i have ever heard imo and i am a audiophile and i need to get a one x.
3) the one s is 5 pound cheaper a month 36 vs 41 (the contract is in my name and im payng the bills lol)
4) she likes the grey metal design of the one s
5) she would no way use 26gb of memory, so the 12gb on the one s is more than enough for her.
I really do concede though I wish I waited the extra month and put the extra 50 pound on and bought the one x over the xperia s not saying the xperia s is rubbish or anything as such just simply the htcs are better. the only things i see thats better on the sxs is the screen clarity due to having 342ppi and the notification led is both clearer to see and does more things and has more colours than just orange and green.