[HTC One X] aszu:
I have got my One X on Saturday (Tegra version, HT24 batch) and I am posting my quick impressions.

GOOD THINGS:

- Build quality is superb, after reading horror stories here I was really worried, but happily my device is perfect - no creaking, flex, gaps, yellow spots etc.

- Polycarbonate body looks really great, although it is a bit slippery. Rubber-like back of my HD2 felt more secure in hand.

- Display is just amazing, colours are vivid and natural (compared to oversaturated, 'radioactive' mess on SAMOLEDs), resolution is perfect (no pen-tile absurd). I don't think any screen in the near future can get much better than this. I haven't observed any flickering at all or graphics corruption a lot of people complain about. My LCD is slightly on the warmer side (but not yellowish), colour calibration and gamma are surprisingly good (this is not something you see on mobiles displays often). If I wanted to be really picky, there is a small particle of dust behind the glass (about one pixel size, looks like a dead pixel), which I can only see under the microscope (sic!) really.

- Touchscreen is very responsive and the glass has got this nice 'soft' feeling under the fingers (some kind of coating?).

- Performance is great, UI is smooth, internal storage is blazing fast (> 30MB/s). It is a joy to use this phone.

NEUTRAL:

- Battery life. Not great, but not terrible either (sofware 1.28). The battery can easily last the whole day (6AM - 11PM) with moderate usage: a lot of phone calls & texts, 1 hour of internet browsing and music, a bit of gaming, 3G / Wifi on + Exchange & GMail push synchronization enabled all the time.

- Sense. I prefer stock ICS, but Sense is not that bad. It has got some nice widgets and sync features. It would be perfect if HTC could just provide stock ICS experience, will some additional wallpapers, themes, widgets and sync options. The biggest problem is that Sense alone eats almost 800MB of RAM on One-X.

BAD THINGS:

- Quality of headphone output is really terrible. There is huge amount of noise (SNR must be really low) and even at the maximum level volume is just OK on pretty sensitive Ultimate Ears 700 IEMs. My old HD2 sounds like audiophile device when compared to One X. Really disappointed here.

- GPS works well indoors and fix is quick, but erratic. Position on Google maps is just floating all over the screen (it looks quite funny), in most cases it stabilizes after a while though. It seems like some output filtering / accuracy reporting issue (GPS reports 1m accuracy which I find hard to believe), hopefully this can be corrected by further software updates. At this point GPS is quite unusable in applications that rely on distance / speed calculations (Sports tracking, Car Nav, etc).

- Camera is overhyped IMHO. The pictures are VERY grainy, oversaturated and lacking details (too much noise reduction?). They actually look worse than from HD2, not to mention my old Nokia N82. The photos I saw in various 'camera is great' threads on XDA are also pretty bad, I am not sure what all this fuss is about. It is probably some mass-hallucination :) The camera is just average, at best. However, you can't deny that speed of capture application is great.

- Not enough RAM - when Android + Sense consumes almost 800MB, 1GB is just not enough. Because of lack of RAM, applications are killed very quickly and multitasking is significantly affected. This device should ship with at least 1.5GB of RAM.

- Software is still unpolished and outdated (2.x kernel, Android 4.0.3 base in 2012 flagship model - HTC, seriously?), Tegra power management is lacking, there are a lot of small bugs. This should be resolved within a few months (hopefully!)

- Lack of MicroSD slot. I am not that concerned about replacement battery, but absence of SD card slot is a MAJOR design fault. First of all, with microSD you could expand your phone with 32GB of extra space for 15 quid or so and not waste quick internal memory for data like movies, music or pictures. Second (I think more important) point is that memory card is great for quickly transferring data between devices and storing / taking backups (Titanium Backup, CWM). If something goes wrong with the phone (it dies, gets damaged, etc.) then you can say goodbye to your data on the internal memory. With microSD card, you just move it to another device / card reader and easily recover your files from it.

It might look like there are more bad points than good ones, but I am actually loving this device. It has just got this 'premium' felling (build quality, screen), it is really hard not to like it. It is just a shame that sound quality is dire (despite of 'Beats Audio' branding) and the phone is plagued with various QC / software issues. I really hope HTC will be able to rectify them soon, this handset deserves it.