I did not notice any POI change with either but then neither were zeroed for any of the test loads at that time so it's really unknown if there was a shift. The M94 was actually the only rifle I've used it on for any load development as I have 3 Oehler chronographs I use for that. I used the MagnetoSpeed on the M92 to just chronograph some factory cowboy action loads for a guy at the range. Again the M92 was not zeroed for that factory load so I can't say there was a POI shift.
I got the MagnetoSpeed simply because a friend couldn't get it to work and threw it in the trash can at the range. I suggested he send it back to the manufacturer, but he said he was getting an Oehler M35P like mine. I fished it out of the garbage can and tried to get it to work but it wouldn't. I called the manufacturer and they said to send it back which I did. They sent me a new one. Told my friend and he said to keep it if i wanted it. I carry it around in my shooting box just to be able to chronograph, mostly when yahoos claim 2900 fps with 140 gr bullets out of their 6.5 Creeds with 18 - 22" barrels.......
One time a couple years back a fellow knew I was going the do some testing with the Oehler M43 PBL so he asked if he could set up his Lab Radar and see how it compared. I had the 100 yard screens down range so i could also measure the TOF and BC and I brought along my M35P and set the screens for it right in front of the M43's. I also mounted the MagnetoSpeed on the barrel of the 308W test rifle. Out of a 10 shot test string the MagnetoSpeed, The M35P and M43 PBL all screened all 10 shots. The data of each was very close to each other. The Lab Radar missed 4 of the 10 shots. Of the 6 shots it captured the velocities and BCs were in line with the velocities of the other three chronographs. Tried another 10 shot test. After losing 4 out 5 of the first shots and then getting lost in the program trying to correct whatever he gave up, packed it up and left the range. I've no idea whether he still has it.......