I have several of the Tristars as well as other "CZ clones" such as the SAR B6P, witnesses, and Jericho 941. I have one CZ at the moment, a CZ85. For me, the quality/performance doesn't justify the extra cost of actual CZs. Back when the Iron Curtain fell and the CZ75 became easily available in America, they were highly sought after and commanded higher prices, this died down a little and for a brief period of time they were the premier pistol bargain, imo.
With the renewed popularity of the CZ75 in the past 5 years or so and with so many good quality "clones" available, with many much cheaper than the base model CZ75s, it's hard for me to justify the cost. The CZs will surely hold their value more than the others, but I try to keep every gun I buy now so that doesn't factor in much with me.
Like has already been pointed out, the aftermarket support for the CZs is much better, and I have not had ZERO issues with all of my Tristars (I have an early T100 that the cerakote wasn't applied well or something, check my youtube channel in my signature where I talk about it).
With all that said, I shot a CZ75 Shadow 2 the other day at the range and I'll have to say it felt and shot great!! That's an 1100 dollar pistol though, did I think it shot 700 dollars better than any of my Tristars? Nope.
Of course, all my opinion, buy and shoot what makes you happy, see if you can find some place where you can rent guns and try out a CZ75 vs some tristars. Take my opinion with a grain of salt, I'm a cheap bastard and always looking for the diamond in the rough, lol.