I bought one of the first 21 Plus 5's Nitrohouse got in stock. I had a regular P5 with 9 gallons on it then I had two modded P5X's with around 8 on both of those. I got less than two gallons on my Plus 5 when you could hear the crome was flaking on the rear bearing. I quit running it and am currently waiting for TKO to come out with the ceramics that fit it. It still has plenty of pinch left because I noticed the problem right away and quit running it. I Break all my engine's in with the heat cycle method and it's worked great so far. I heard the problem was with a very small number of the first batch because the bearing manufacturer made a mistake. I bought a P5X at the same time I got the Plus 5 and had the exact same problem, swapped the bearings and it's fine. I know several people who have bought them recently and they scream with no problems.