I've personally used the Trijicon M250, M300W, NVision Nox, AGM stingIR, Iray MH25 with the FLCOS, and the newer MH25 with the OLED, one of the only FLIR Breach 640 12 BOSON, and the Iray RH25 and RH25 V2.
I've used them as hand held, helmet mounted, weapon sighted, as well as clip on "if applicable" and I always tell guys my favorite thermal to date was the RH25. Now I have to admit it's the RH25V2.
As you can see in the pics, it boasts a huge ocular lens, giving you an amazing amount of forgiveness in eye relief, and allowing you at least a 5X mag when using as a clip on. I don't know exactly how much the display has actually grown, but I do know it's significantly larger than the V1, easily noticeable when compared side by side.
When I unboxed the unit, my first thoughts were the weight. I didn't know all the specs at the time so I weighed it with the pictail and the lens cover along with an 18650 in comparison to the Rh25 V1, The V1 weighed in at 13.7oz and the V2 is 12.7oz. I guess going to the machined magnesium body gave it a slight edge in weight reduction.
The other nice upgrade was the USB-C charge/data transfer port. I personally didn't have any issues using the 18650 batteries, as I would carry a spare in my agilite bridge, but now we may be entertaining the option using the unit with an external power source. The new V2 also has audio, which is amazing for us now you'll hear everything.
Another upgrade to note is the polarity, the polarity is on the same level as the RS75, TX60 and RH50R, which is the best I've seen in any thermal unit.
At a price that is 1K under the OG RH25 this is gonna be an a$$ kicker fellas. 5K for the new V2 is well worth it IMHO.
There is also the significant upgrades to the RL25 V2, with it's major talkingpoint being the ability to use it as a clip-on as well, and at a 3K pricepoint.
I have been using this for some time now and have a dozen coming to inventory this week.
I will also be doing a full review of this unit along with my personal helmet set up and a side by side comparison to the RH25's V1 and V2.