Got about 25 runs on mine and are waiting on a screw kit to show up to do some heavy maintenance. I've bought spares as well and the diffs are def upgraded - HPI reduced the brg boss the brg goes onto on the ring gear to allow running the bigger 8x16x5 brgs vs the 10x16x5 brgs that failed all too often on my 4.6SS. I replaced those everytime I got near them.

I have the hardened 18/23 upgrade and it'll go in so I can put the ordinary one back in my 4.6SS and run it again. These were in short supply when it became obvious that these were going to be a wear item.

Want to turn my batt boxes around so the lids open away from the chassis so I can use the Neuenergy 3S car size pacs lipos. The lids don't open far enough to get these thick lipos inserted, 2S lipos have no probs. I've been real pleased with mine so far, been loads of fun.