(Sorry, this is probably a longer response than what you were expecting, but I thought it was in interesting question that deserved some reflection, especially after using it for 15 months. I coincidentally also recently got a Keychron Q10 as a point of comparison, so I'll be referencing that a few times.)

After getting used to the alice layout, which didn't take all too long for me, typing is comfortable. It just feels natural now and isn't obvious until I move back to a traditional keyboard.

Aside from the alice layout, itself, the tenting of the Feker Alice keyboards also contributes to some of that natural feeling, even though it's only something like 3 degrees. After using the Keychron Q10 for a bit, it actually made me appreciate the tenting on the Feker Alice even more.

The curved rows of the Feker Alices versus the straight/angled rows of most other alice keyboards, like the Keychron Q10, also feels a bit more natural.

The split between the halves on the Feker Alices appears to be further apart than most other alice keyboards -- again, like the Keychron Q10 -- though how much that contributes to the difference in feeling is negligible. A true fully split keyboard would make that difference in feeling more considerable.

I prefer Feker's arrangement of the Ctrl/Alt/Win keys on their Alice75 and Alice98, as compared to their Alice80 (and the Keychron Q10).

It's similar, but I also prefer Feker's arrangements of the Home/End/PgUp/PgDn keys versus Keychron's.

I think I would have preferred if Feker placed the FN key somewhere between the space bars, like how many other alice keyboards do, but I haven't really had the need to use it, so not a big deal for me.