You got that right about flimsiness... I drop my flash one time, while I was sitting on a chair onto wooden floor and the distance that the flash can fall was less than 1m, at the most around 750mm, and a large corner of the plastic mount chipped off... and that was on the second day of my usuage... (of course I am blaming myself for being a clumsy fella). But I have dropped my Yongnuo 565EX (Canon mount) and Canon 430EX II many many time, a couple of time, I drop when I was in standing position and that was certainly more than 1m, onto wooden floor or grasses, and both that flash survive without any chips.
my point is... as and when you get the FL600R flash, do take care of it, and not drop it like I have... and you will be fine.