I had my Hikky 1A perched on my (then) CRT monitor in battroid mode about 4.5 feet high. Then one of my pesky cousins had to shake my monitor and it fell, hit my keyboard table, bounched off and hit the ground, splattering the missles just about everywhere. I was totally gonna kill my cousin (that was my 1st and only 1/48 at that time, a penniless student and I had just exchanged my precious YF-19 ver 2 for it) Thank God it survived the fall with ZERO damage.
Since then I've got a display case to keep all my valks in just to make sure I do not suffer a heart attack unnecessarily...erm..if it was ever necessary
So, they are pretty durable, though I would never wanna tempt fate again.... lol~!