I was excited for this, but the R5 bottom row kind of kills it for me. Sure, flat keys are great when you use you thumbs on them, but when you have to press them with your pinkys, the R5 angle is absolutley more slippery than the R4 one. I wish something would run that would just offer the best of both worlds. Since I'm looking for something I can use in games where I'll need to hold Ctrl down a lot, the R5 bottom row is just not going to cut it for me.
The reason for the R5 bottom row (flat, similar to Topre HiPro) is not only the ergonomic advantage when using the thumbs, but because R4 is very aggressive at around -13 deg. Compared to -7 deg for SA.
Having tried both R4 and R5, I feel like R5 is more conformable in general. Or to put it another way, R5 is less uncomfortable for the pinky than R4 is for the thumb.
That being said, consider that the complete R5 molds don't exist yet for MT3 doubleshot. Right now we are more focused on colour matching.
Here's an update on MT3 SNES:
As you may be aware, MT3 Susuwatari suffered a bit from inaccurate colours (compared to the renders). To make a long story short, merely sending some colour codes to Drop's supplier is not sufficient.
The process we're trying out is to order various plastic chips, make a selection, send them to Drop's supplier and finally receive some actual keycap samples. Rinse and repeat as necessary.