Hi carebear,
You are absolutely right and they should not be advertised as no-line. I think that you don't have to line them when you do M&P but that doesn't do any good for those of us who do CP. I should never have said it was not a negative.
We received a donation of a couple of hundred dollars to be specifically earmarked for updating our soap molds. I had been using wooden molds for years and none of them matched. I had ordered them custom made but each one was slightly different, which drove me crazy. But I used them and they were getting very shop worn. I decided to try the molds from Mr Do Right, or whatever his name is, because they looked very sturdy and the though of not having to line them really got my attention.
The first batch I made using them stuck so bad that I couldn't get it out no matter what I did. I ended up cutting the soap out and I was so mad I threw it all away. When I calmed down I came to the conclusion that I was just going to have to line molds. I have been lining them for so long now that it doesn't bother me anymore. I do like the shape of the molds, although the bottoms are becoming a little warped now and I have to keep turning them over. The sides bow a little if you turn the bolts too tight as well.
I haven't tried silicone because it looks flimsy to me, or am I thinking of the wrong thing? I think that next time I will just look for some wooden molds that are about the same size as these and leave it at that. I think that the wood holds the heat better anyway. Sorry for the ramble.