I’ve been using this scope for over a decade.
I originally selected it based on “ease of use” as described by users then - the eyebox was described as being rather generous then.
I’m thinking of getting a newer model, but can’t really justify doing so beyond having this itch for a new toy.
How does it stack up compared to the newer models?
One thing to keep in mind as a "general" rule, the shorter the erector (smaller magnification range) and the longer the focal length typically means more forgiving eyebox, DOF and parallax. I say this as a general rule because there are things you can do with an optical formula that can correct for this, but those "things" tend to increase the price rather quickly. Take for example the Hensoldt 3.5-26x56 - this is one of the most forgiving high erector designs I've seen in a short focal length (ultra short style) body, but you are going to pay dearly for this in both cost and weight. You can find something more forgiving in the more traditional longer focal lengths like the TT 5-25x56 and even the somewhat shorter ZCO 5-27x56.
Leaving the CA arguments aside, the K624i has earned a reputation for being "easy to get behind" this typically refers to the the eyebox experience. That said, shooters are also claiming the K540i which has double the erector (8x vs 4x) but also claiming it is very forgiving

I won't really know until I get one for myself but I have a hard time believing it is "as forgiving" as the K624i but who knows what pixie dust Swarovski may have sprinkled onto the K540i...
OP - the best thing to do is try to get to a range or comp where some guys may have some of the newer/better scopes to see for yourself, just be sure to adjust the diopter to your eye first as a bad/wrong diopter setting can throw off your experience pretty far. If anything, maybe a Cabela's/Bass Pro is nearby and they might have a Vortex Razor Gen III 6-36x56 which would be a good optic that might be available locally to see side by side with your K624i...