They seem to have much better black levels than any LCD or plasma technologies.

But, unless it's a newer DLP2 based TV, it will have problems with anything shown on screen that should have a bright reflection. It's a weird issue of DLP, and I would have not known had a sales person at a local shop told me about this.

LCD projection looks really good, comparable to DLP from what I saw in the store. Make sure you actually see the TV you want first before buying, or at least one close to it in specifications.