After installing to 1.0.2.80.7 (still amazed by your work) I can tell that Write speed is approx. 30MB/s and Read speed approx. 50MB/s. I tried on Seagate Backup Plus Hub Desktop 8TB (NTFS format) and on SanDisk Extreme Pro 64GB (ext4 format).I face 2 "problems" with this firmware.
The read-write speed to the HDD through WiFi dropped to 30MB/s (constant) but with Netgear firmware I could reed/write over 55MB/s and sometimes write speed was even 80MB/s
I cannot rename files on the HDD. I think that it's something I do wrong though.
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