In Aug 2012 my Televue Genesis fell off the mount when I forgot to tighten the mount screws ....
It fell on a concrete tiles floor
So I unscrewed the objective cover which was very tight as it was slightly deformed by the impact and I expected cracks in the objective, but NO cracks.
Then I mounted it again (now tightening the screws decently), pointed it at a treetop and put the highest magnification eyepiece in it (200x) and saw an unscathed image !!!
After dark I did a star test on Arcturus and saw a neat Airy disk !!!
So this scope is really built like a tank !!
In the meantime I sold it and replaced it with a 110ED which has a shorter build length (for travel) despite its longer FL and provides at least the same quality.
And my greatest disappointment is also my very first observation in my life.
Wednesday, 8 December 1965, I was 10. There would be a small lunar eclipse visible in Europe which was my very first eclipse, I just started with astronomy. I had no telescope or other optical device, just my eyes. It was not total, but I expected red discoloration.
On the very moment 18:08 local time I saw a normal bright full moon so I considered the prediction as fake.
It turned out to be a penumbral eclipse of 88% which only shows a slight dimming on one side of the Moon and as a boy of 10 I had no idea what that meant so I did not notice it.