If you have subtitles on all the time it will work without problem.
If, like us, half the household need them and the other half find them annoying there is one small plus and two small negatives.
The plus is that the subtuitle settings are retained individually for each channel so in our house the kids channels and E4 have them on all the time whilst BBC4 has them always off.
The negatives are:
1. Whilst there is a button on the remote to turn the subtitles on and off it involves three key presses to achieve this.
2. If you have paused live TV you cannot turn subtitles on if they are off or off if they are on. To do this you have to press the stop button to go to the live feed, alter the subtitles then rewind to where you were.
These negatives are very minor and are irrelevant if you have subtitles on all the time. Even then they wouldn't stop me buying the machine - it has transformed the way we watch TV.