I'd say the experience was rather positive. I've gotten T-reg with about 73K on the odo without any major issues or problems. Now o have just shy of 79K. Haven't done any mods except for putting performance air filters and changing fog light to LED. When it comes to handling I'd say it's the best handling SUV that i've owned so far even though those 5200 LBS definitely letting you that they are there when you trying to drive aggressively. Another positive is how confident and stable the truck is when you push it well into triple digit territory. Now for things that I didn't like so much. Very light steering feel even at speed. Truck feels just adequate when it comes to power. Those 350 horses and 324 lb/ft of torque definitely not enough for such a heavy vehicle. In my opinion 4.2 V8 from RS4 with 420HP would do much better in T-reg. Another annoying thing is cooling fan staying on for 2-3 minutes after engine is shut down. I don't know maybe because my build sheet says i have tropical climate model or because it equipped with tow package or a combination of those two. HID could be better as well. My main concern so far been related to tire wear. I bought it with almost brand new Nexen tires that previous owner just put on it and after about 5K on them they seem to be half way thru their life already. Would probably switch to Michelins or other brand that has higher tire wear index.