They are OK if you don't mind filling/smoothing the gaps you will have, as ceiling corners are very rarely square.
You will also have more joins to fill.
I used them in my living room and I liked them so much I hauled it all down and started again - minus the corners!!!
Like Trazor says, corners are never 90 degrees and I think it looked horrible with the edges not quite right. I ended up buying the coving mitre and doing them myself - even though the mitre cut them to 90 degrees it was so much easier to sort out the gaps in one place, in the middle of the corner.
Thanks everyone, that's pretty much what we thought. Just thought it would be far quicker as my husband has always done the corners himself before and it has taken eons.
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