Mastic is the quick easy, but not the best way. Mastic has a better "hang" when wet than thinset, but thinset will have a much better "grip" when cured. Micheal Byrnes tile setting book is an excellent tile book. Check out Fine Homebuilding books web site for more info.
Just because someone is a professional doesn't mean they do professional work. I just bought some wall tile and the sales person asked if I needed mastic for that too. Looked at me totally crazy when I said mastic was the wrong product for that.
ONLY place I would use mastic is on the old aluminum tiles. Cement based product will corrode the alum.
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