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Performance center shield has ported barrel. Not something I'm a fan of.

I have a shield 1.0 9mm with the full Apex trigger installed. The pull and reset is noticeably better than stock. A previous shield I owned had just Apex spring kit installed and was about the same as the full Apex kit. A few things you should know about the kits. The only thing different between the spring kit and the full trigger kit is the actual trigger itself. The hardest part of installing the kit was installing the trigger onto the trigger bar. Their instructions tell you to use a hammer and punch. After a lot of pounding I could not get it to install. Further browsing and an email to corporate revealed that you actually need to use a vice to get the pin to set. If I had thought it out better I probably would've ordered the trigger kit with the flat trigger and maybe a little bling. I've liked how it feels on other guns I've owned.

The video for trigger installation below:

https://youtu.be/pKvzfG4mBcI

I do not know if the trigger kit makes any difference on the 2.0 models.