We hired Harmonia Strings for our ceremony and cocktail hour. We'd heard a cello/guitar combination at another wedding, and while it's a unique instrument combination, we loved it. Harmonia Strings was happy to honor that request and tailor a...ll our music requests to that instrumentation. Djeina was very quick to respond to every email. They had a nice selection of traditional classical music, and some non-traditional pop and Broadway tunes, which is exactly what we were looking for. They also incorporated arrangements of songs we wanted that were not already in their repertoire. Though I didn't hear much of their performance myself at our wedding (the one down point of being the one getting married!), I was told by everyone that it was beautiful and they did a wonderful job. My dad (who didn't really know what kind of music we'd booked prior to the wedding) was pleasantly surprised and couldn't stop talking about how nice it was.
My only minor comment is that sometimes email correspondence made things a little confusing. I didn't realize up until close to the wedding that if we wanted them to learn additional arrangements of songs they didn't know (more than 3), that it would be an additional charge. I'm pretty sure I'd asked for clarification on that in a previous email, and there was nothing of that nature stated in the contract, so I was surprised to learn of the additional cost. Fortunately, we didn't need them to learn more than 3 new songs, so it was a non-issue... I just would have liked to know a bit more up front.
Overall though, great musicianship and a reasonable cost compared to others.