i have used kenwood headunits in the past.. not bad.. easy to adjust the settings on.. but i have really only used 400+ series.. kenwood's been around for a while, and a lot of ppl like them..
the ryval amps dont seem to be terrible amps either... as far as phoenix gold is concerned;i only have personal extended experience with their xenon line...
i have installed ryval series in other people's rides, from an installation handling standpoint, they seem to be well built amps.i am not a huge fan of the plate connectors, i am partial to direct connect terminals myself..... i havent seen what kind of real output they do tho.. but i imagine as any other phoenix gold product the ryval series wont disappoint for the price