I had downloaded almost 15 different SMS components from various sites. All of them could send SMS but had some limitation or the other. After downloading mCore, I did not have to look for any other product. All its features worked with 3 different makes of GSM modems that I have. Excellent help file (served like a tutorial). Great Sample codes... and voila am sending SMS in chinese too!
I wish the publisher adds delivery report and some .Net samples soon.