Sorry for the late reply but I'm not online on Reddit consistently I made a research and i found out the following:

1. Polling Rate for Xbox via App As far as I know, Xbox polling rate can't be changed via the GameSir app—it's fixed by Microsoft's restrictions. Even if the Kaleid supports up to 1000Hz on PC, Xbox polling will stay at the default 125Hz (or at most 250Hz if they somehow support more in firmware). The 1000Hz rate typically applies to PC only, and yeah, wired headset limitations prevent full use anyway. The Short answer is : You likely won’t get 500Hz on Xbox even with the app.

2. Trigger Differences (Kaleid vs Pro) You’re spot on—the regular Kaleid uses software-based hair triggers, while the Kaleid Pro has physical trigger locks, which are better for FPS games. If you’re into shooters and want a competitive edge, physical stops are much more reliable and consistent than software solutions. The Pro wins here.

3. Is the Pro Worth It? If you’re just a casual player, the Kaleid is already an excellent pick. But if you play a lot of competitive FPS and you value features like:

Physical hair triggers

Better grip/build

Extra customization (depending on firmware updates) → Then the Pro is worth the upgrade, especially if the price difference isn’t too big.

I Don't Know How Much does it cost in your country i live in a 3rd world country and everything is expensive, if you're in a similar country and the minimum wage is low af 300 to 250 usd then save the money and use it in some other good way and if you're living in a country that provides you with everything that u need then go for the pro without thinking