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All chronographs can be quirky. Even the M2 can be finicky with light.
Yes, the infrared kit helps alot but it also adds to the cost.
IMO, the ideal setup is to run two chronographs in tandem. Basically, one chrono proofs the other. This was the principle with the Oehler.
The Oehler P35 had a third screen with two timers. This setup took two velocity measurements of each shot. If the two readings weren't comparable it threw and error.
My choice of a chrono would be the ProChrono Digital. It's half the cost of a M2 and just as reliable if not more. It's a basic unit without the frills but I think they're the best value for the money (<$100). If you bought two, you could "proof" your shots.
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