GLS is fantastic and I tend to use it wherever it is available, I think the testing on GLS autolands for the 380's in SYD was so accurate that they had to stop it as one particular piece of tarmac was getting worn out with all the landings.
As mentioned in another thread, if you need the 380 off before the critical area in Gatwick you just need to ask early enough and if we can do it we will. 08 ops work much better than 26 because of the RET design.
Our company ops now puts RNAV approaches on the same level of priority as ILS/GLS so it's quite good to practice every now and then anyway.