mine only has a rough idle when the start stop kicks in and it restarts before the light changes.
I haven't driven a v8 lr4 yet but have loved the amount of power from the scv6, as well as the 8 speed. coming from a 5spd auto nissan xterra (plus a pile of extra weight in armor), I really appreciate the torque of the scv6, and the almost always locked converter of the 8 speed trans. I do find that under spirited acceleration it shifts like a manual, but I feel like that is more to preserve the drivetrain. I also wished a bit that this motor was turbo rather than sc, but i don't think the super low rpm (1,100-1,200rpm) converter lockup would be as effective with a turbo, since the turbos wouldn't be spooled that low, and if they were, they would be well out of steam by 7k, and I think the gearing is well suited to the supercharged v6's powerband.
Once the supercharger damper needs replacing, I'm considering getting a rebuilt snout with the smaller pulley for a little power bump as well. power starts coming in around 2k now, which is around 70 in 8th, and it would be nice to have a bit more torque from about 65 on up in 8th