http://www.tackletour.com/reviewbottomline1200.html (review of the 1200)
or
http://reviews.basspro.com/2010/73438/reviews.htm (review of the 4200)http://sonar.ru/manuals/download/eng...ine/fb4200.pdf (operations manual for the 4200)
I have the 4200 but still in the box. Haven't used it yet. My friend has one older model he likes very very much. We were at Cabelas and I asked for his advice. His does not have the side view feature. He said he wish his had the side view. He recommeded the 4200 so I purchased it for $219.
I have not used it yet. So I cannot comment on it. However I posted some links for reviews for you.