Jeremy Moore said:
I've been looking at the same back, from the design it looks like the shen-hao/seagull back. The red counter window is the same, but I've only seen the back of one of these (the shen-hao/seagull) holders in an ad
The back in the link above is not the same as the DAYI 6x12 that Badger Graphic and others are selling under the Shen-Hao name. The DAYI/Shen-Hao back is made from all metal construction. The one on eBay is partially made from plastic. The one on eBay also carries the following warning:
"Tips: Don't pull out the dark slide completely when taking a shot."
That makes it sound like the light trap where the dark slide is inserted is not light tight. I have had no such problems with my DAYI/Shen-Hao 6x12 back.
For a picture of the DAYI/Shen-Hao back, see:
Dead Link Removed
Comparing the two pictures will show that these are clearly not the same back.
I have no experience with the lightweight back from the eBay listing. So, I can't comment on it's quality or performance. I have been using one of the DAYI/Shen-Hao 6x12 backs for almost two years. While the design is definitely low tech and the construction "industrial-grade", I have had no function problems. The simple, even crude, design and construction has very few moving parts to break or wear out.