Have not used the latest but have been using HD38s for 3 years and have access to 50. They have transformed all aspects of shooting be it foxing at night or deer stalking. Last week was out with Sussex Fallow as he dropped by, found a few does but no bucks. One very long field of organic grass when scanned with bins was empty yet with the thermal we had a heat soucre about 20yds infront of us. Could be a fox or a fawn. It took a good 5 mins of very careful scrutiny with the Leicas to eventually find and identify a roe kid whoes mum we presumed was in the roe doe we had seen in the adjacent field. Once you have used one then indispensible. Its a pity they dont make one with a proper rangefinder in it. Dispense with the gizzmos and just get rangefinder as with thermal it can be very difficult to range esp on new ground. Current problem is that with the grass being so long its easy to spot quarry but then impossible to see it through a Drone or Photon due to the cover.
D