In this set you get a 1/100 Gundam Frame 2 and all the armour parts to make either the Gusion or the Guision Rebake. The key word is “either”.
At the time of writing this review, there's no other way of getting a Gundam Frame 2, so you're paying the same as you would for a large MG or 2 other 1/100 IBO model kits, but only getting one frame that both models need to share.
That said both model kits are good quality just like the other 1/100 IBO models, not MG standard but still very good. But unless you also buy a 1/100 Barbatos and heavily customise the frame you're stuck with half a box of unusable Gusion/Rebake parts.
If like me you're a big fan of the Gusion or Gusion Rebake then go ahead, just know what you're getting yourself into.