I see from comparing the old vs. new specs that the old sensor claims to have a 120-degree field of view with a 130-ft. range, whereas the new one claims 100 degrees with 15 ft. The range of the former almost makes it seem overly sensitive, though I've never had any problems with them inside. The smaller angle isn't too surprising given that the lens on the new one appears to be slightly more recessed into the sensor body (which also seems a tad wider though I didn't compare measurements--it's likely the case if these take a CR123A considering v2 was barely wider than the CR2 it took, which I've also never had a battery-life problem with except the one that contained battery-eating manufacturing defect.)
I see they're listed for the same price, and my Lowe's claims to have one in stock, but I can only justify buying so many more motion sensors before I become a crazy person. 
I guess I'll have to wait and see how well others report these to work! The v2 sensors were always my go-to variety. If these don't work out well, the 2018 Samsung ST Motion Sensor looks pretty good and seems to be working well for me so far, plus it includes an adjustable magnetic mount (albeit one that makes the whole thing quite large; Iris v2 are tiny).
