I've got LED's (Non R, but same reflector housing for high beam) - I've found the light to project quite nicely personally, with the LEDs set with the actual LED (Light emitters) Horizontal, taking full advantage of the reflector housing.
The light output is good, with the colour temperature matching DRLs and Dip, and better picking out reflective signs and similar.
If you very carefully scrutinise the output, there are some bright and dim patches, however, in use these aren't noticeable.
It's worth trying LEDs for the sake of ~£20 for some reasonable units on Ebay - If you find you like them, you can always look at investing more, though I'm quite happy with the performance of the cheapo units.
[video=youtube_share;OlpPJjqk98M]https://youtu.be/OlpPJjqk98M[/video]
That video should give you a basic idea of the turn on time and projection, I'll see if I can find some better quality images.