I have had a couple (actually still have one in my truck console). I usually carry a small lighter in my watch pocket and reasoned the case would ensure the button didn't get accidentally depressed, draining the gas. For that, it worked well.

Unfortunately I found it made the whole package much easier to loose. While the Mini Bic itself will generally stay in the little pocket without issue, in the heavier (and slicker?) case it had a tendency to work its way out. After loosing a couple I decided just to carry the Mini Bic itself.

While I have had one case of finding an empty lighter in my pocket since going back to just the Bic, I check it fairly regularly to ensure its okay (that's how I found it empty, fortunately not when I actually needed it).