MotionVFX is a useful resource when you need editorial polish at speed: clean titles, transitions, overlays and purpose-built tools that can be used as a starting point rather than a generic effect dropped on everything.
The catalogue makes most sense for Final Cut Pro editors, with select products available for DaVinci Resolve and Apple Motion. From tracking and masking through to creator-focused motion packs, the stronger products solve a particular editing problem quickly.
My advice is to buy for a live project. Start with the tool or template pack that will save time this week, check its host-app compatibility and only then consider a bigger bundle.