Flying Club

Just started with FS 2004 @ Xmas tried some of the lessons from the software and wondering about purchasing Flight 1 Flying Club, I have some Mesh for the UK installed Ground Environment, and Ultimate Terrain Europe. Will the scenery files for Shoreham airport interfere with the data in GE or UT???
I am currently reasonably happy trundling around the UK using VFR with the default Cessna are these planes in this package better than Microsofts and are payware planes any massive advantage over the default planes???
I am currently reasonably happy trundling around the UK using VFR with the default Cessna are these planes in this package better than Microsofts and are payware planes any massive advantage over the default planes???