Abilify IMHO is only worth a try in new onset cases, and in such cases there is not so much damage to the brain, cases where it's known to work very well. If it works, great. No sedation, low chance of weight gain, great. Schizophrenics being so for decades with lots of noncompliance? I've never seen it work well. It's also not a very efficacious med, being one of the lowest efficacy antipsychotics in CATIE with only Seroquel being weaker.
For antidepressant augmentation? It's pretty much a last end choice. There's several $4 meds (e.g. buspirone, low dose lithium), several other meds that are not $4 but much cheaper than Abilify such as thyroid hormone, Lamictal, and they got more data and are safer (well not lithium, but the others are), and others that are OTC such as fish oil.
IMHO there's no reason to start anyone on Abilify for antidepressant augmentation except last-line. We're talking about a med that's hundreds of dollars/month vs a $4 one and likely being being safer. Even by then the patient is likely in a situation where ECT is needed.
Even if the person needed an antipsychotic for MDD with psychotic features, why not just give another atypical? Risperdal, Geodon, and Zyprexa are now generic and also have strong data showing they work for antidepressant augmentation at low dosages.