V4 looks good. It's running faster than 3.2 and the coil appears more 'accelerated', a little more sensitive and responsive. It's strange for me to see minus discrimination... I tested more than 200 hours with -6,4 discrimination but i didn't find any single target to show/hear a value between -6.4 and 0.
The MI-6 pinpointer is like a normal one, it stays good in hand, it's submersible:
-with Deus you can adjust its sensitivity till 50, but at this level you can't use it in the field because it has a 50-60 cm (2') almost spherical range, (you'll not realize from what direction the target come) so i put sensitivity at 32 = it's about 7cm (3") depth, it's fine.
- you can change the sound and create 4 custom programs. It has a searching program if you loose it.
-the pinpointer's battery is very good. I detected 5-6 times x 8 hours and it's still at 60%.
-i couldn't succeed to switch off the pinpointer's LED light (i tried 10-20 times :)) )
-the remote control's battery in V4 with 11" coil and pinpointer has a higher consumption (+25%) vs. V3.2 ( but you can count for 2 days, i used headphones, not RC's speaker)
-the 9" HFcoil's battery consumption is aprox. 1/3 lower than 11"s black (maybe a 3-4 days' use at 30-50 kHz ).