Used Hohner Marineband 364 Low C for years, they sound great but they're a bit bulky so I decided to try one of Seydel's low harps.
I tried their 1847 Silver in Low C and so far I am very happy with it.
Its very responsive and bends nicely. For a regular sized harp, it's got a big sound too. My only gripe would be the plastic comb produces a good sound but is not as warm as the wooden combs. If you're after a warmer sound then i'd go for the 1847 Classic range.
On the whole, it's a great instrument at a great price