I've only been a premium theme user for a short while, but I am so far loving how easy these are to implement. My most recent theme purchase was Yosemite and it was incredibly easy to implement. The only thing I got puzzled by was the alternate featured area options. One quick forum question later and I am setting my website up with ease. The advice I was given was spot-on.
I'll be watching for future themes. Who knows, I may revive an old website I'd otherwise given up on
Many thanks.