Answers:
Warranty - one year warranty on the LEDs, I very rarely had issues with LEDs, either they work at the beginning and last a very long time or they just dont at the beginning. Also will provide warranty against factory defects.
Note - things like condensation is common with any new headlights, be sure to get them use to the local weather conditions before installing them, especially if it is hot and humid. A bag of silica gel in the headlights will help.
For the RHD version, we have to wait and see, the minimum order quantity is 50 sets for the RHD version as the manufacturer normally only makes the LHD version.
The Golf R front grille has a thicker chrome piece which aligns with the headlights. On a regular Golf grille, the stripe is much thinner so it looks like it does not line up.