I'm almost half way through the DBT course, and although some of it is helpful, some of it is quite distressing. I find most of the basic skills can be helpful, but other suggestions make you feel worse. I actually had DBT today, and the group was discussing it. One particular suggestion that really caused ripples was when you're feeling bad, think of someone who is in a worse situation than you are. The general consensus was that that idea sux. You just end up feeling guilty for feeling bad. DBT has helped with my BPD, but definately not my SI.

That's just my opinion, it may have worked for others.