This works like a charm. We replaced a Nutone IS68 with the Aiphone with no problem at all.

EDIT 2/26/2015: I discovered something important. I got lucky on the first one I installed. I used two runs of 18/2 thermostat wire because the home store was out of small spools of 18/5. The distance was about 25 ft. (50 ft. of wire for both runs) and everything worked great. I bought a second intercom for my daughter's house and got a spool of 18/5 so I'd only have to pull one wire. BIG MISTAKE! Nothing but static. I tried all kinds of things. I finally resorted to running a separate line of 18/2 for the voice. I still connected it to the existing doorbell wire near the transformer, but I was careful to keep the voice run several inches away from the power run as much as possible. Presto! Crystal clear voice. So don't mix power and voice in the same sheath, use two separate runs.
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This unit is everything I needed and nothing else. Aiphone has another model that is battery powered and will unlock a door, but it does not have a lighted button and does not go "ding dong" at the outside unit. I wanted the light and "ding-dong" and did not care about battery power or door unlock, so this model is ideal for my needs. In fact, I just ordered another one to install in my daughter's home.

Hooking up the outside unit is a piece of cake. Just remove the existing doorbell button, move the two wires from the old button to the intercom and screw the new unit to the wall where the old button used to be. Now hooking up the inside unit is another story. The instructions are pretty good, but there are multiple ways of hooking it up based on how your existing doorbell is wired. I know my way around electrical circuits so I figured it out okay, but I can see how it would be intimidating for a real novice. You have to pull four wires from the inside unit to the transformer. I used two runs of 18/2 thermostat wire. Two wires connect to the transformer for power and two wires connect to the old doorbell button wires coming in from the outside unit to carry voice. Snaking the wires inside the wall was the most difficult part of the installation. But once done the intercom works great and makes for a very tidy looking installation. Voice is very clear and no interference. Be sure to use good wire, keep the connections tight with new wire nuts, and don't run the wires close to any AC wires.

You don't have to use an existing doorbell transformer and wiring if you can't or don't want to. Just purchase an Aiphone 12V plug-in transformer and connect two wires to the transformer and run two wires directly to the outside unit.

Pricey but the exact replacement I was looking for.

This review is for the actual Chime/Intercom & not the picture. :)
I installed this (security) system Oct 2009.

Nearly 9 years of use. It has never failed to do the job.
Exterior unit has bright little light to locate in the dark.
The pleasent but hearable door bell can be heard throughout my small house.
The vocals are clear and crisp on both the interior and exterior speakers.
You do not need to expose yourself to someone at your door anymore.

* Update: August, 2018 - This unit is still working as it did new in 2009. Amazing...
I would recommend this for purchase and would buy it again.

Easy way to get a 2-way voice intercom at front-door.
I really like the feature where I can listen anytime (just quickly press the button and you can listen anytime), _you_ do not have to wait for _them_ press the "doorbell" button to listen-in (unlike the other expensive Wi-Fi systems).
The voice quality will vary depending on your wiring, if you had really old wiring for an older doorbell it might or might not carry voice clearly ???
This is for a new house and I'm actually using structured wiring adapters over COAX (RG6) (use adapters "2 of BNC Test Lead Set to Alligator Clips Length-48", Amazon # B0002JJU4G ) and voice quality is fine.