The M&S system retrofit intercom works well and looks good. The system is easy enough to install yourself. All connections are labeled and the tech people are knowledgeable and helpful when you call. Two or three issues I had were easy to resolve, but you may want to hear them before starting. The head unit does not come with the power transformer. It must be purchased seperately as does the door chime. The transformer is a part of the rough in box if you need that. Also the instructions are a bit incomplete, just call the tech number if you get stuck. Last, the LCD is set to be viewed from level to below. If the unit it is mounted too low you will have to bend down to be able to read the display. I'm 6' and I mounted the unit in the old hole and I have to step back to read it, but my wife likes it.
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