I'm looking for reading material, youtube videos are often too promotional. They are great for showing how something works, but I'd like a side by side comparison / analysis of the two if there exists such a thing.
We investigated the TeraSpan method, got into pretty serious talks with them. Had all the installation demonstrations and product demos. I can put you into contact with the local rep if you want. It's some seriously cool stuff, very neat and makes for a beautiful deployment. Very clever kit. At the end it was just too expensive, and made competing against traditional methods at local labour rates impractical.