Any experience w/ lightweight NVRs available on aliexpress?

Welcome to the forum..do yourself a big favor and buy the NVR from a US retailer with warranty and support. Those cheap mini nvrs are plagued with problems. What good is saving 100-150 dollars if you need to search high and low for firmware updates and/or have issues where you unit does not record. Remember onvif is not a perfect standard and not all cameras will work well with that nvr.