How Meditation Techniques Compare: Studies

As y'all know I'm not a huge fan of the scientific approach, and I don't tend to follow much scientific meditation studies, but I did find this one interesting. They recognise that there are different types of meditation that do different things, and class three basic techniques: 'controlled focus' (e.g. single-pointed on an object), 'open monitoring' (e.g. vipassana) and 'automatic self-transcending' (e.g. just sitting) - though the latter category is taken from TM terminology, which confuses me because I thought TM taught a mantra practice. Anyway, from a quick google this triple classification has been around in the scientific literature for at least a few years, but I only came across it here, so it may be new to some of you too...

How Meditation Techniques Compare

That is, however, comparing them in terms of how much they produce a relaxed state or pleasantness? No mention of awakening, or the potential for difficulties that might be triggered if a person 'accidentally' starts having insight...