I typically get replies regarding my bug reports, but it depends on the bug I’ve reported. For example when I reported issues with custom ringtones and notifications lacking vibration on my NP2. Got a reply later on it seems to be caused by OS 2.6 and will be solved “later on”. Now with OS 3.0, it’s working well again, although the phone still doesn’t vibrate when selecting and previewing tones inside the Glyph settings, but at least its working now everywhere else.
Regarding feedback of course it always depends on what kind of feedback you give and how they like it. They won’t implement every single feedback request they are getting.