Following Catullus' Lesbia poems, Propertius is the first of the Latin erotic elegists proper and has a deep influence on Ovid. Loeb's translation is fluent and flowing but as it is in plain prose it doesn't really convey the texture of the Latin originals.
The Cynthia poems which sit at the heart of the Propertian texts go on to have a profound impact on the dynamics of erotic love as represented in western literature so it is definitely worth reading this first to see how literary erotic love develops under Petrarch, Wyatt, Sidney etc.
In lots of ways Propertius gets squeezed out between the rawness of Catullus and the mocking self-knowingness of Ovid but he plays an important role in the erotic love tradition. And the poems themselves are vibrant and often very wittily clever.
If you have even a little Latin then this Loeb is probably a better buy, but if you don't then I would recommend the Guy Lee translation in Oxford World Classics.