Queen Cage

[Haddon]

I was wondering if anyone has tried these
http://cgi.ebay.com/10-new-beekeeping-bee-keeper-tool-multi-bee-queen-cage-/260773920672?pt=LH_DefaultDomain_0&hash=item3cb7563fa0

Looks like the slots are big enough for worker bees to get in and out.
I would use them like JP's queen catchers to help keep the hive in the box after removal.

So if anyone has tried them let me know what you think they are a lot cheaper than queen catchers but a lot more expensive than the standard plastic queen cage.