[General Topics] italianquadcore:
I never used a tablet in a car, only smartphones, but anyway I try to create a "pros-and-cons" list for using T10 in a car - obviously these are only my opinions:

Pros

1) T10 has a high-capacity battery, 8100 mah. It can be used in a car to watch movies, play music, and watch photos, useful for entertainment. The only "con" is that we have to quick charge it (I will discuss it later).

2) T10 supports a micro-sd card, up to 128 GB capacity. I confirm this matter because I am using a 128 GB microsd card and it properly works. With a such amount of storage, we can play all media files we need.

3) T10 has got an Earphone jack and two powerful stereo speakers, good for watching movies and playing music. Furthermore we can use bluetooth earphones/speakers.

4) CPU/SOC is powerful enough to watch Full-HD (and even 2K/4K) movies, using a high-res display. The display is not the best on the market, but it is good enough for multimedia.

5) GPS is properly working, even without network connection, and it is good enough. Some days I posted a screenshot of a GPS app, I was at home, so the performances will be even better outside.

6) If we need an internet connection, we can use either the wifi connection of the car or an external portable 3G/4G wi-fi router that we can properly use via AC wi-fi connection (2,4 Ghz and 5 Ghz). Regarding wifi, I can confirm that, through 5 Ghz, I achieved up to 200 mbit/sec connections here at home through a fiber-router - this should be enough for 3G/4G connections.

Cons

1) The only "serious" con is charging this big battery, that means it is difficult to find one excellent charger for quick charging such a big battery. If for me it was so difficult to find an excellent ac/dc charger compatible with Mediatek's Pump Express, I have no idea if there is one excellent only-dc charger that we can use in a car. Anyway we should have one charger that provides at least 10 watts (we do not care about voltage), just to avoid a fast discharge when we watch movies or when tablet performs heavy tasks.

About your questions regarding screen films:

1) I have removed both provided screen films and replaced with other third-parties screen films. One was opaque (not transparent), it was good to avoid reflections and I noticed no fingerprints, but the overall color/image quality considerably decreased. Another one was very difficult for me to be applied (it had the same size of the display), in the end I trashed it. The last one is universal, but it is cheap and there are so many fingerprints.... horrible!!!

2) If you remove all films, the quality is the best you can have with this kind of display. Teclast advertises T10's display is "high-brightness, clear in both indoor and outdoor, high-resolution, and with oleophobic coating anti-fingerprints", I confirm all these points. The only "con" is that the glass is not a Gorilla Glass, so T10's display is more fragile than Gorilla Glass-based display. Not only it cannot protect from strong hits and impacts, but also it cannot protect from severe scratches. Only for this last problem we may use a screen protector (for the first one we can use a flip-cover or an additional case), but it is very difficult to find one with anti-fingerprints oleophobic coating and it is very difficult to find high-quality one with no impact on colors and overall image.