Not scientific but me playing around.
Ordered a brand new V1 a few weeks ago with the latest xxxx25 software & put it up against my trusty 1.7 the last few weeks. The 1.7 went in for a tune up due to some laser falses but I now think it may have been my truck causing the falses due to low voltage and not the V1. My truck battery died a few days later so that could have been the problem the whole time causing the laser falses. Also noticed the “low voltage light” on my HR-12 when the battery was dying. Mounted them both on each side of the rear view mirror with no performance or interference issues noted.
Both units in big A mode mounted high on the wind shield above my rear view mirror on my 2001 Silverado truck, just below the blue top tint line.
X Band - The 1.7 is the clear winner here. I have not picked up an X band radar in a few years so I went by door openers. Seems like the 1.8 has been detuned on X band. No real issue here.
K Band - The 1.7 was the winner by a hair but very close to a tie on both real encounters & my HR-12 gun. A few times the 1.7 would beep a second or two before the 1.8. Not enough to matter at all. When testing in the truck with my HR-12 they both alarmed at the same exact time when the gun was triggered. An interesting note is when you aim the gun directly at either V1 at a few feet away it was about 1 second delay before they went into alarm at all. This was true with both the 1.7 & 1.8. Aim the gun away & they both alarmed instantly when the trigger is pulled. Conclusion, the 1.7 kicks butt on K just as good as anything else out there today. Makes you wonder if the slimmer case has a smaller antenna inside the 1.8 that accounted of the second or two delay on real radar encounters from a few miles out. Again, not enough to really matter. K POP never encountered & not tested.
Ka Band - Here is the big surprise. It was a dead tie on actual radar encounters. No clear winner. Sometimes the 1.7 would alarm a few seconds before the 1.8 & about 50% of the time the 1.8 would alarm a few seconds before the 1.7. I expected the 1.8 to whoop my old 1.7 but it did not happen. Got a LEO brother with a Ka radar in his patrol car but never had the chance to play with his radar against my V1. No real need to. Plenty of real Ka encounters to judge performance by. Ka POP never encountered & not tested.
Laser - No real encounters but the 1.8 sure had a lot of false alarms in bright sun light. Even more than my old school Blinder M10! I got about 10 in one day when driving to the sun while my 1.7 never alarmed a false laser at all. Also noticed the 1.7 will not alarm on my Bushnell range finder but the 1.8 alarmed every time, even with an off axis shot at the truck. Very impressive of the 1.8's ability to find laser from the Bushnell. Just wish it did not false alarm on laser so much. This is 50% of the deciding factor that will make me send the 1.8 back until the laser false alarm bugs are gone.
J Feature - The 1.8 only "J"ed a few times but the 1.7 never issued a Ka peep either time. My first impression is this is a useless feature. This is other 50% of the deciding factor that will make me send the 1.8 back until the"J" bugs are gone. After a while this would get old.
Likes- Love the slimmer case but you have to wonder if it slightly affects performance due to smaller antennas.