I have the NT-555 on my G35's Daily/Track set. They're great for street and aggressive driving. Not noisy, tend to be on the "soft & comfy" side (compared to my Toyo T1R). Not the best deal on long track session since they tend to loose grip after 20 mins of hot laps. Then again, these weren't made for the track, so I didn't expect them to hold up any longer than that. But I lasted a full track day with hardly any tread wear at all.

I can't say anything about the BFGoodrich g-force T/A KDW because I haven't own them.