I had Vitz, and instead of pouring Toyota CVTF-FE, I poured in CVTF by Caltex / Havoline, as it met OEM requirements and was priced at almost half (or even further less) than the Toyota CVTF.
I drove my car for almost 20,000 Kms before selling it, and AL HAM DU LILLAH, nothing happened. No jerks, slippage, etc. or any sort of check light, malfunction, etc.
So based on my first hand, personal experience, I am reiterating that no harm in going for aftermarket items, as long as they meet / exceeds OEM requirements.
PDS of Caltex CVTF: https://cglapps.chevron.com/sdspds/PDSDetailPage.aspx?docDataId=495355&docFormat=PDF%20