I have more experience on CP300i now. I have it connected to a TrueHeading AIS tranponder.
It works excellent. I find the AIS very usefull when sailing in areas with much trafic and when sailing be night. I think the size of the screen is appropriate. A smaller screen would be too small.
I am sailing from northen Sweden down to the Canary Islands and in December I will sail over to Trinidad.
Leif Risberg //Cantippa 1212