Things I liked: Overall, these are as good and consistent a pellet as you can buy, short of the individually hand-selected and hand packed competition ones sold in foam pellet holders. Works very well in my LP-10 and IZH-46M. I think these work every bit as well in a match rifle as do the heavier "rifle" rounds.
Things I would have changed: RWS needs to reintroduce variable size heads in the USA. The 4.50 rounds are just a bit too tight in my Izzy, and it matters. Oh for a good 4.49 round!
What others should know: Yes. If you're shooting AP and can't regularly put together 10 shot strings over 90 points, don't bother too much about doing comparative testing. Stick with R-10s. Don't try to save money by shooting with Hobby pellets either; train the way you will shoot when it counts.