I work as a radio producer and I wanted to get my own gear to do some independent productions. I haven't had the chance to explore every possibility with the H5 but I've tried it in both field and studio like environments and it's a well built device with tons of functions and nice sound. It has a rugged feel to it and fits well in my normally sized hand.
The x/y capsule that comes bundled does a good job, the preamps are pretty silent and it captures details very well. But, as with all condenser mics, it's very sensitive to wind and p-pops, so foam/fur windscreen is a must. The shock mounts on the x/y capsule works well and brings the handling noise down.
I've tried the H5 with a Sennheiser ME64, a hot condenser mic, and it works beautifully - the noise floor is almost gone.
The battery-life, the possibility to pair it with up to 2-4 external mics, the durable construction and the reasonable price makes it a good buy!
On the other hand, with an even lower noise-floor - the H5 would be even more versatile when it comes to external mic options.