Having used other Aristo-Craft, Train Engineer Systems previously, I found the Revolution System very easy to install. Like the previous on-board 27 MHz and 75 MHz receivers, the Revolution receiver plugs into the Plug and Play socket found in most Aristo-Craft locomotives.
QSI makes a DCC decoder with sound that also plugs into the Plug and Play socket. To obtain radio control you can add the G-wire receiver. It attaches to the decoder with a small ribbon cable. When I purchased this system several years ago, the AirWire throttle was used to control it. I am sure by now there are other throttles available that could be used.
In our club the Phoenix Sound P8 sound board has become the sound board of choice. They have excellent sound quality and are reasonably priced ($150-$160). The down side is the number of wires required to install the board: 2 for power, 2 for the speaker, two to sense motor speed, two or three for sound volume control, 2 to 6 trigger wires depending on the number of sound functions you wish to control with the Revolution throttle.
There are less expensive sound boards available but many lack the sound quality and features that the Phoenix Sound boards offer. Some like Sierra, are also incompatible with the PWC output of the Revolution receiver and require an additional board to operate properly.
The Revolution receiver comes with an adapter board for installations in non Plug and Play locomotives. A Plug and Play Board is also available separately with the receiver socket on it. Installations in USA trains diesels are not difficult and there is information available for specific locomotives. Unfortunately the voltage regulators used in some USA diesels are incompatible with the PWC output of the Revolution receiver and the lights will not function properly. However there are ways of rewiring the lights or replacing them with LEDs.
I like the size of the Revolution transmitter because I can slip it in a shirt pocket while throwing switches or uncoupling cars. Unlike some DCC throttles it does not have buttons labeled for specific sound functions, but the trigger wires can be connected to the sound board trigger wires to make it easy to remember. On my throttles button 2aBc is for the Bell, 4gHi for Horn, 5jkL for Less sound volume, and 6Mno for More sound volume. If I have used trigger wires for independent control of my LED headlights, button 3deF is used to turn the Front headlights on and off, and the remaining button 1 for the rear lights.
No matter which system you use there will be a learning curve, as well as, pros and cons concerning features. In our club our members have quickly learned how to install and operate the Revolution system. I get more questions during our operating sessions about the 27 MHz and 75 MHz legacy systems than the Revolution Train Engineer. I believe the easy to read English menus really make it more user friendly.
I have found the reliable and responsive range to be 200 feet or better. Radio range is better on raised railways than those on the ground. Unlike previous Train Engineers, the receiver antenna is very short which makes installations easier.
The firmware on the Revolution throttle can be upgraded by Aristo-Craft to incorporate new features. When Greg suggesting the MU process be simplified during the alpha testing period prior to release of the product, the firmware was changed. The firmware has recently been updated to be able to accommodate the new remote control switching device.
There is a lot more information on the system. Kevin did a review in Garden Railways a while back, and the manual is available to be read or downloaded from the Aristo-Craft web site.
and cons 
of the system.