I have used multiple Surface Pros (Since SP1) running CA with no real issues in the past five years. I haven't used for raytracing but plan and general modeling of roof planes, interiors, etc. without much lag. On my last CA install when at first it was running sluggish/jumpy in plan view I knew there was some simple thing I had done before so I came back to the forums and found where HamlinBC had recommended turning off the Crosshairs "Edit>Preferences>Edit and then at the top is your cross hair settings". Cross hairs off was the simple fix I needed, CA runs great on my SP6.
Discussion about Bluetooth lasers is great, thanks Mark & Mike, I have a Bosch GLM100c and unfortunately (to my knowledge) Bosch doesn't have an option like Leica/Disto does to direct input to CA, no way to connect it to a windows computer, only a phone or tablet and utilize Bosch app, (have no real interest in room planner app). Its a great laser but I have never understood why they would make a Bluetooth laser that won't connect to a PC as an input device.
A handful of notes I found when starting to do site measures in CA onsite if anyone is interested read on:
A few years ago when I started direct input into CA on jobsite one of my concerns was not having a paper notes to go back on if something wasn't working out right, or say you go to the next room and it moves your wall then you have to go back to the other room...so when we would finish out a room I would use the Make Room Polyline tool to lock in a record all the walls surfaces in the completed room. Additionally that polyline would help define if there were some wall thickness discrepancies. On my profile drawing I would make default cad layer thicker and red and change it after field measure was complete. Small note boxes were helpful for odd and ends that didn't want to spend the time to model on site, additionally since Bosch laser didn't communicate with PC I found working in decimal inches productive. Used the Surface Pro in tablet mode without the keyboard, onscreen numpad ("numpad emulator" on sourceforge) as small as I could comfortably use it, and have the SP6 in a Blackbelt case from Kensington case for 2 reasons, fear of dropping, and hand slot great for holding with one hand while shooting laser.
One thing I just acquired which will do away with taking a few hundred pics (or more) per measure and still somehow missing that one area where the soffit intersects the... is a 360 camera where I can just spend 5-10 minutes walking through site recording 360 video, walk around each room, then when I'm cleaning up the rendering later off site I can play the video, pause where ever I need to and pan around like I'm in a CA rendering and look at every visible detail of the existing structure.