Saint-Simon has certainly been lauded over the consecutive years for the vivacity and sharpness of his style (though how much of that translates over into English is obviously a matter of debate!). It's worth noting, however, that he is quite a cynic in many regards and is especially harsh towards Louis XIV, of whom he notes:

"His mind was occupied with small things rather than with great, and he delighted in all sorts of petty details, such as the dress and drill of his soldiers; and it was just the same with regard to his building operations, his household, and even his cookery. He always thought he could teach something of their own craft even to the most skilful professional men; and they, for their part, used to listen gratefully to lessons which they had long ago learnt by heart.

On a subjective level, though, this cynicism can be quite useful. It allows for a bit more criticism of 'The Sun King' who in most other accounts for the next century would be presented as this sort of epitome figure to which his successors had trouble living up to.