I bought these mikes mainly for use on solo acoustic guitar. They are extremely sensitive and have absolutely no self-noise. They have cardioid pattern and with some work on positioning you'll get great results, but if you record in the room with poor sound isolation, they'll still pick up ambient noises in the background (like street noise through windows, or rain pouring), it's very low, but audible in recordings of soft and slow solo pieces played in high volume, so think about some room threatment if you recording at home.
Pros: The sound is clean and transparent. Slight high-end lift adds nice airiness, which is trademark of KM184. If you're looking for clean, crisp and bright sound - these are for you. Even through cheap interface the sound is crystal clean, but you'd want to plug these mikes into something more expensive for more warmth and detail.
Cons: none, but make sure that every piece of equipment in your chain (instrument, preamps, room) is on the same level of quality, so you'll get maximum results.
They come in the pretty wooden box which is packaged in another cardboard box. Stand joints are a bit stiff and can leave scratches.