When I ordered the 4LT package I was a bit skeptical, but after seeing the Linen first hand and feeling the difference in comfort and support alone compared to the 3LT or below I'd definitely say it was worth it. The only compliant is actually not even the cars fault, and that is the tire roar at highway speeds with the run flats. I've driven the last 3 generations of Vettes and this is by far the most advanced.
Head up display, linen interior, dual mode exhaust, the shifter is 10 times better than '07 I drove, and the amount of ease to bump up the horsepower to 500+ while retaining around 30 mpg on the highway! GM has come a full 180 since 2000 even, major kudos.
LED tail lights, a new contract for different run flats.