All in all, its quite an interesting pack. Some of the sounds are quite "cool", and would be good to show LFS off with.
However the majority of the sounds are aggressive / meaty due to the aggressive clipping. The sounds rely on the clipping to sound like that, so I would find them difficult to drive with.
Conclusion: Will make you NFS fanboys happy, but not really usable for racing.
P.S. This is only my opinion, you don't have to take my word for it.