Reverse Integration process can be used to install applications when u slipstremed sp1 or Sp2 but after making installation permanent and before generalise & shutdown. But some appliacations fails i don,t no why so better method is after installation.
U can use PRograms>turn windows feature on & Off to remove these features after installation. Also you can revert changes by simply back these features on.
Tweaked Vista is much Better as there is no complications in installing service pack,updates or other applications but in vlited vista u might face problem like that component missing etc. Also tweaked vista is more stable than vlited vista.
VLITE CAN BE USED WITH WINDOWS 7 BUT NOT YET CERTIFIED BY NUHI FOR WIDOWS 7. YOU CAN USE IT BUT YOU HAVE TO ADD YOUR BETA KEY IN UATTENDED SETTINGS OTHERWISE PROBLEM OCCURS.
AS VLITE SAID IT CAN,T DOWNLOAD UPDATES FOR REMOVED COMPONENTS BUT IN SOME CASES IT IS NOT TRUE, DOWNLOAD UPDATES MANUALLY IS THE ONLY SOLUTION TILL NUHI FIX THEM.
Vista sp2 integration works fine even on Vista RTM with sp1 integrated through vlite. Only thing is that First you have to slipstream sp1 through vlite & then you can integrate SP2 through reverse integration. It worked for me & must be work for you also.