"My experiences with the aftermarket CPS are just insignificant snapshots in the scheme of automotive understanding. The "off-brand" was AIP, and Dan Page's experience was, like yours, opposite of mine: https://www.brickboard.com/RWD/volvo/1604824/220/240/260/280/art_b_tell_aip_crank_sensor_experience.html"
I had an AIP CPS fail on me less than a year after I installed it. Although out of warranty AIP was gracious enough to replace it as a good will gesture. The replacement was doing it's job up until the time I junked the car and removed it to live again in another car. They are still available on Amazon for a very reasonable $23.
https://www.amazon.com/AIP-Electronics-Crankshaft-Compatible-Replacement/dp/B00FSCAQEA/ref=sr_1_fkmrnull_2?keywords=aip+volvo+crank+sensor&qid=1554923637&s=gateway&sr=8-2-fkmrnull
Dan
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