I think brochures like this just point out how careful you need to be. It is trying to sell a product. They do at least suggest that you take independent tax advice, but I'm sure many people don't do it. There is no mention of fees or the funds you might get and the worst thing is the way it glosses over the protections of the US/UK DTA.
This whole area is very difficult for the regular expat. Advice is expensive and hard to come by, taxes and investing can be complex for even the simplest of circumstances and you often need to go to at least two separate professionals. Be careful out there.