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You'll love it! Tuned my '12 MKS 2 weeks ago and was running the stage 4+ 91 and last night switched to the stage 4+ 93 (noticeable difference IMO). I also have the stage 4X 93 waiting and will try it next week for fun. After that, I'll switch back to the stage 4+ 91 because it's plenty and getting 91 octane is much easier than seeking out 93 around here. You'll most likely be getting the V10 tune since '13+ SHO/MKS get a different naming system than the '10-12 models.
are you worried about no warranty from being tuned. Like if the trans or ptu goes and they see you had a tune ?