I saw the first two episodes
Potential to be quite good! The principal actors are all great. I was a little put off by the cliche teaming of Houdini and Doyle with a lady cop, an incredibly rare person in 1910 London, but she is a pretty good character. The scripts are pretty well written. It's still a bit of a raw product, but I can see the show becoming great over time as the characters become more filled out.
I was quite impressed with how accurately they recreated the water cell illusion. They carefully studied photos of Houdini performing that trick and recreated all the props perfectly.