As I said, it "can" happen...maybe in 1 out of 100 cases, often it's even less than that. So if you drop it by accident, in almost any case your saber will
not be damaged. Also, the other components (LED, sound boards, Emerald Driver) have been built and tested to meet the high standards and battle-readiness Ultrasabers promises. So you can even duel with full-equipped sound/Emerald sabers (like I do) and it almost never gets a scratch or starts to malfunction! I only have sound sabers and one sound/Emerald, all four have been used in various battles and they still work like a charm.
I'd say that you don't have to worry about using them even when it comes back from repair - of course it's up to you which saber you want to use, and if you feel better when using your stunt sabers...why not
And what I said about the electronics and force - I meant that in the rare case that your saber gets damaged, that damage will often not be visible (and noticeable) at first. It only comes through when the wrong spot is stressed at the wrong time, which is also a very rare case.
Long story short - you can use your repaired saber with no restrictions in any duel, 99.9% of them will not harm your saber at all!
And since I don't have to transport them very often, I don't use any protection case for my sabers right now, my sabers are clipped into some shores of my stainless steel shelf with Covertec Clips. This also helps with the Recharge ports being accessable for charging.