It's a good deal if you intend to fully dslot your equips/have the funds to. I understand not everyone has that budget or build in mind.
Treating the items as Clean+dslot+mpot 36 is still very much considered a good purchase at the price of just 15k each when purchasing all 3. You can reroll the bpot and inno it. You save perfect stamps as well.
You are also able to use them temporarily while you inno and mchaos items you desire one by one. Being able to start training asap on a new ab to 235 to start earning arcane force is a bonus.