I lifted mine with King Springs. It was a 2" lift but once you take into account: the bullbar, winch, Rocksliders etc...... It became about a 28mm lift. I was still happy with this. I didn't have any vibration problems but after reading up on all of this I did some comparisons with a TD5 and came to the conclusion that the main issue is that because of the height of the Puma engine they have tilted the engine, gear box and transfer case all nose up to the front of the car. This is what causes the issue. As standard they are already running a fairly steep angle into the transfer case but lifted it puts the prop shafts right on their limit. I can only assue the main reason some people have issues and others don't would be because of varing "true" heights of a 2" lift 
 
 
I put a double cardon jointed prop shaft 654mm (from Devon4x4) into mine about 2 years after the lift had gone in and interestingly enough when I removed the orignial shaft it was essentially bound up and I am guessing just about ready to fail :0
 
I personly think you are doing your whole drive train a big favour in putting either a double cardon prop shaft in or at least one of the extreme angle units.
 
My two cents 
 
 
Cheers,
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