Alright. Spent half a day with the Type Heaven and its stock ABS keys then brought it home and typed on it with PBT keys for a bit, doing a bunch of side-by-side comparisons and what not. This is a Type Heaven vs a 45g 87U:
The stock Type Heaven by itself feels more... rigid than a Realforce. The bottom out just doesn't have as nice of a "cushion" as the Realforce does, the ABS keys produce more of a thack sound than a thock, and they definitely wobble around a little more than the Realforce. My Type Heaven also felt like it required slightly more force to press the keys, though I've read that can just be Topre switches in general.
With PBT keys on the Type Heaven, it still types the same pretty much. Nothing changes with the bottom out, but the sound becomes a little more thock-y, and the wobble decreases (looks like maybe the gap between sides on the stems is smaller on the PBT keys). The keys themselves obviously have a different feel to them (the ABS Type Heaven keys legitimately feel cheap compared side-by-side with the RF PBT heh), so that improves the typing experience a little bit, but it's just not the same as a Realforce overall. Maybe if the sliders were lubricated or something the feel would improve, but at stock it's not as smooth.
If you were already planning on buying the Blue keys and can find a Type Heaven for a fair price (I paid $125, though there may be one on Amazon for
$100 + shipping), then I'd say it's not a bad route to go for a work keyboard with the replaced PBT caps on it. I know for me personally my plan is just to use the Type Heaven with stock keys until I can find a new 104UB-DK at a reasonable price.
