I got this the other day as well. With regards to frame rates, DON'T WORRY! It has to be one of the most frame rate friendly sceneries EVER. With no AI on, this runs on a par with DEFAULT scenery, incredible!
The only thing that will hurt your frames is the AI, there are LOADS of parking spots and it will reduce them drasticaly.
That 'runway line' is a bit odd but on the whole it's 1000% better than the blurry low res' photo textures used in the Heathrow Pro scenery.
The only thing i'll miss from the Heathrow Pro scenery are the animated jetways and service vehicles. There are non in the Aerosoft version, you have to pay EXTRA to get that by useing their AES addon.
I would SERIOUSLY suggest AES. Ask anyone who uses it (Me, JBaymore, Mees, Ashar, Mic) and I'm sure there is loads more.
FS is simply not complete without it 8-)