I was more excited about buying this software than usual, as it was the first scenery-changing add-on I had bought for flight simulator. Understandably I was apprehensive about getting this over an aircraft add-on. Installation was very quick and immediately took effect when starting up simulator.
You'll have to see it to beleive it when I tell you that 'Heathrow airport' literally becomes...Heathrow airport! The true-to-life taxiways are a refreshing sight to someone who was used to seeing the same old banal taxi lanes at the default airports. The accurate photoreal terminal buildings with the unique control tower really makes you feel like you have done flight sim justice. Other great touches (which I my self like many others take pride in), such as 3D localiser beacons and approach lighting make landing much more exciting. The two runways look gracefully aged by the array of tyre marks running down the centre line. The selection of mirrors and electronic guidence devices make parking fun and realistic.
On the flip-side, the static traffic is, well, static. The graphics of the added planes are below standard and don't add a great deal of realism to the game (Terminal 5 is occupied by about three BA 737s). A much smaller issue, is that the ILS frequencies and course headings in the airport information box on the map have been deleted, menaing that there will be nothing on the arrivals page of the FMC if you using a detailed add-on aircraft. All said and done, this problem is mitigated by the mini Jeppeson schematics, which not only provide you with this information, but gives you a plethora of performance tables and appr/dep maps. This takes the form of a small booklet which is included in the case.
Overall, I would definitely recommend this add-on, it's visually a great thing to look at, but be warned, once turning Heathrow into a mega airport, you'll never want to fly anywhere else!