Actually I had a Xenon-R and it was not the best experience. You do need a 2013 to run it perfectly, any other pipe will not work (did try, 2052, 2015, 2017 and 2006). Unlucky within Europe All 20xx Sirio Pipes are banned and no new are develloped.....
Beside that, after 5 liter changing the rod it did not fit, a tiny production failure making a to small hole for the crankpin I had to drill up. Messuring the crankpin did show on the end-tip an egg-shape with 0.03mm more play. 2 liters further the rod broke. These experiences do keep me on a distance from Sirio (based) engines.
I have seen the P7L-black and I must say it did impress me for that money, I think that even the serious racer with a tight budget can use this engine as a spare. For now I will stick with the Eagle 9.s and will take a look to the new Stockversion of this engine until our own engine is race ready.