Yes, they are worth it. Of the two you listed, I would go with the SG. While I have not used a Kuiu pack, other than the side zip off long johns, every item I have tried from them has been disappointing (pants, jacket, socks).
Exo is great (what I use), Seek Outside is great (I have one, does not work well for me). SG is great (I have an Avail, so no experience with their load hauling frames, yet). Kifaru has a solid reputation (though they are the heaviest and most expensive).
An example, Scarpa makes outstanding mountaineering boots as does La Sportiva. Almost without fail, if a person likes one the will hate the other. For me, La Sportiva fits well, Scarpas do not. Packs are similar. That is why I still recommend SO, the design is solid and well executed even if it does not work well for me.
Other brands can work, but there is a reason the four I listed come up repeatedly as good options.
Exo gives a 30 day return window so you can try the pack out. I think SG and Kifaru do the same (varify that).
Exo is great (what I use), Seek Outside is great (I have one, does not work well for me). SG is great (I have an Avail, so no experience with their load hauling frames, yet). Kifaru has a solid reputation (though they are the heaviest and most expensive).
An example, Scarpa makes outstanding mountaineering boots as does La Sportiva. Almost without fail, if a person likes one the will hate the other. For me, La Sportiva fits well, Scarpas do not. Packs are similar. That is why I still recommend SO, the design is solid and well executed even if it does not work well for me.
Other brands can work, but there is a reason the four I listed come up repeatedly as good options.
Exo gives a 30 day return window so you can try the pack out. I think SG and Kifaru do the same (varify that).