$1190 for a dyno tune and a piggy back thingy that allows to swap back to stock is reasonably good value on the face of it...
BUT your car probably will not run that well if you flick the switch back to stock after the mods anyway so limited value.
I've seen JC members claim 270rwkw tuned from same mods on an L98, and if it makes you feel better it cost me about three times that to get that power with an auto L77 (however its more tricky with e85 and AFM).
Your manual ECU-only tune is worth between $500-$800 in my experience, and the computer thingy is reasonably a coupla hundred but unless dude spends a good few hours tweaking on the rollers to reach not less than 270rwkw...
YOU ARE PAYING TOO MUCH, like Wazza said, likely another smartarse with a crappy lappy hocking a slightly cooked flash to mop the hp that's left on the table from stock plus mods, a spin on the rollers to print out a healthy dyno curve, and a useless piggy back thingy that saves you a trip back to pay the bloke to reflash if you ever need to tear down all your mods and refit as stock. Keep looking on eBay, there's a jungle full of discount LS tuning experts.
And to the sycophantic tuner-worshipping shitstirrers, I agree with what Wazza said, there's not much to the dubious business of charging MORE THAN A GRAND for a 3mb file upload, and the process of increasing hp is still mechanically straightforward.