Well depending on if you need a top or not, I think they are cool for stands and for areas that you want to keep little hands and paws out of but they don't give you much viewing. Also if you do fleece or shavings, if you do shavings I could see where these would work well. For me, my cage is in the corner of my living room so there is a couch and a love seat on each side of my cage. I don't get much side viewing and I have a cover on the cage so I couldn't seem my piggy much if I used these. And she wouldn't be able to see out as well.
If your cage is on the floor or you mostly view your piggy from the top I would think these would be great for shaving filled cages although the coroplast should keep most of the mess in especially if you do 6" high front and side with 12" high back walls. I have seen people build their cages out of these before. I think they would be really attractive for the stand, especially if you could find silver grid for the cage so it all matches. I like it when everything matches
)
The down side to these.. a lot of people use extra grids to build other things like ramps, lofts, hay racks, cave hideys, fleece forests, you couldn't make a lot of those items with these type of grids and I don't think they are the same size as regular square grid but I am not 100% sure about that.
