I loved the 5s until the third hit, then I combusted. You must draw very quickly after the time is up if you keep holding the button on (what I'm doing)
Every owner is encouraged to try different timing combinations to find out what works best for their personal preference, because since everyone's blend may be slightly different in terms of dryness and finess of the grind, results may vary a little between user to user.
Also, it should be noted that as you vape, your herbs get more dry with each puff, and so your timing will also need to be adjusted slightly to compensate for this. But as Pak and many other FVers have mentioned here, its not hard to get the hang of it with a little practice, and your efforts will be well rewarded once you master its usage, as the FV is a very powerful yet versatile tool.