I think that it is too good to be true from the point of view of cost. Also, I have not found any information at all on how long these frames might last. They are primarlly plastic so forever seems out of the question. Even if they last five to ten years, I do not think the economics work. I have to crunch the numbers and see what I come up with (this -20 C/-4 F temperature here this morning will have me looking for something to do indoors).
The thing that I keep thinking of is that I figure I will have $12,000 - $15,000 CDN in hive equipment for my near future target of 100 hives. Adding these frames would cost $50,000 CDN plus shipping and modifying boxes thus nearly quintupling my hive equipment investment.
To put that into perspective a little more, if I can manage to achieve our current provincial average honey production of 93 lbs/hive at a current wholesale value of about $3/lb, I would have around $70,000 sitting out the field in anticipation of about $30,000 gross annual return. Even if I put in the extra work and retail my honey at $6-$7/lb, the numbers are still not close to working.