H5 : Certain improvement over H4

I've extensive experience with H1, H4-n, H5 and H6, and I must say that H5 is my favorite.

Pros:

External mic preamps are very quiet, much better than H4

Handling noise is minimized thanks to the matte surface

Detachable internal mics makes it compact and much easier to use it for booming applications

I love the protective metal over the gain knobs

Works as an interface

Cons:

The internal mic quality is still disappointing (not a significant improvement over H4). You gotta turn the nob to around 8 most of the time to get a decent sound but taht introduces an awful hiss. Also, I find the high frequencies quite harsh, almost distorted even in medium gain settings.

Internal mics are way too frail, I broke a plastic part already when it fell from only half a meter height

Interface is tedious

No internal memory

Only 44 and 48 kHz operation when using it as interface (no 96)

Get this if you will mainly use external mics, the preamp quality is worth the upgrade from H4 ,and it's very affordable. If you don't need the extra inputs, I find H6 redundant, because sound quality is very similar if not the same. If you'll only need the internal mics, I'd recommend Sony D100, but that's in another price range. I'm afraid Similar units like Tascam won't be a big of a difference in that manner as an alternative.