It does show how overpriced the Viewport is; here in the EU that thing is priced exactly the same as the NVR Instant (€214,80), but the NVR adds Protect, 3.5" HDD support and a 6-port POE-switch.
But their offerings sort of overlap:
€214,80 NVR Instant: 15xHD / 8x2K / 6x4K with 3.5" HDD. Runs...