Not ready for prime time
Kosher restaurants are closed on the Jewish sabbath and holidays, and their teudot hechsher (certificates of kashrut) call them kosher. "Kosher" restaurants are open on Shabbat and Yom Tov, and their teudot hechsher say that all the food served in them is kosher, but not that the restaurant is kosher.
On one hand, I think that a restaurant claiming to be kosher should be closed on Shabbat and Yom Tov. On the other hand, since I, myself, still eat in non-kosher restaurants (avoiding meat, poultry, and shell fish, which I haven't eaten, even accidentally, in over 15 years), who am I to refuse to eat in a restaurant that serves only kosher food just because it's open on Shabbos? Bottom line: I'm trying to stick with Shomer Shabbat (Sabbath-observant) kosher restaurants, but if I'm with other people who want to eat in non-Shomer Shabbat kosher restaurants, I'll join them.
There are tzitzit and there are tzitzit
In my opinion, there's a big different between a tallit gadol and a tallit katan, and not just in terms of size.
The tallit gadol, or large tallit (garment with tzitzit/ritual fringes) is worn over one's clothing, and only at Shacharit (Morning Service).
The tallit katan, or small tallit (as known as "arba kanot/four corners), is usually worn under one's clothing, and is worn all day.
I've now been wearing a tallit gadol for 41 years.
But I can't picture myself wearing a tallit katan anytime in the foreseeable future.
For openers, I'm a coward. I never take off my jacket in the office before noon, lest anyone see my tefillin-strap marks. I'm simply not prepared to stand up--or, rather, to stand out--and be counted.
For closers, I think that the wearing of a tallit katan says something about the wearer's observance level that the wearing of a tallit gadol doesn't say. And I'm not ready to make that commitment.