My DaYi from ecbuyonline2008 (http://myworld.ebay.ca/ecbuyonline2008) arrived. Wow. This film back seems to have all metal construction, spring loaded latches hold the two parts together securely. And everything is light tight it would appears. The entire advance assembly even goes into a sloted, and recessed holder that is all foam and felt lined. The Guohuo film holder is a joke compared to this one and when you compare the two, you really cannot understand why the Guohuo is even being sold.
I'll have to test it out this week.