The mailman finally delivered me the package that I ordered from BetterScanning last week.
Inside was a MF holder, MF ANR glass and 2 35mm ANR glasses for the V600.
Quickly loaded a 6x7 frame and ran some quick tests. (3200dpi, 24-bit, unsharp mask checked)
Here's the frame that I scanned with the Epson Scan software and the BetterScanning glass and holder
and here's the same frame scanned with the holder that the V600 originally came with
Zoom in and you can see closer the detail that the V600 is able to capture from a MF film.
Left: Epson holder
Right: BetterScanning holder
I don't see much difference between the two, the BetterScanning holder and glass may have 5% boost in IQ but it's barely noticeable, however we need to keep in mind that the BetterScanning holder has adjustable height, right now it's at stock 0mm.
Tomorrow I will try to increase it to 0.2mm.
Another quick test I decided to do is a Epson Scan software vs VueScan but for some reason the scans from the VueScan are not in focus or sharp. Then again never liked using the VueScan with it's antique and complicated interface.
VueScan scan with BetterScanning glass and holder
and close comparison between VueScan(right) and Epson(left)