Do you like them $900 worth? If one already has SCT (I'm guessing GH tunes are roughly $500), that's what it boils down to. I'm sure SOTF will be more, but that's a different question altogether.
I had SCT with Innos, then went to Ghead (yes 500 for theirs), then bought Spar on the Ngauge. I had a couple issues with Ghead and had a delay when I hit the pedal on my truck. Yes I would do it again. Kept the Livewire TS for monitoring, don't care for the ngauge.