I'm interested as well. Only thing I can chime in about is the cost. When I compared I could buy the elite 5 HDI unit for almost half what the chirp models were going for. Now you ask yourself is the quality that much different when fishing off a kayak? Is that extra detail of the arch really significant?
Those are questions that so far I'm leaning towards no based on reviews and pictures. As much as I want the latest and greatest I'm not convinced it's worth it unless I own a boat but who knows how a good sale can changed ones mind