Not really.
Adv pack is far more agile
With gravi its
- Jump->Go
- Land->No energy use
Gravis only real asset is its OP defense that completely trivializes the entire battle aspect of the game.
- forget to press pointless ignition button->Press button->Jump->Go
- Land->Forget to turn off gravi->Power drains to nothing (thanks for the 'warning' at 0% asshole machine!)->Turn off->Curse to self->Wait for UltiSolarHelm to recharge->Crap its nighttime->More expletives->Invent ingenious system with enderchests and enderpouch, gates and MFSU to recharge it anywhere. (more proud of that than making the gravishite)
Yeah, but it is much faster and it can let you to hover without any difficultes. And I turn off the jetpack each time I land, so that won't be an issue for me. And probably, powering GraviSuit is the the only reason why I would make an ultimate solar.
Protection can be worth it too, since I don't want to die by a bee explosion...