I went from an XM 30 S to the FH25R , its not an apples for apples comparison , but the Finder is far superior in image.
It was the size that initially attracted me , I was used to much larger thermals like the XQ and 'turd' shape models like the Hti and Eye series, I wanted something that would fit in a pocket or hang round my neck without dragging my head down !
Im still using the Finder over a year later as my main spotter, Ive looked at others and they just dont tick the boxes on improvement.
Yes I would prefer more base mag than the Finders 1.5x , but this is what makes the image so clear.
The rangefinder isnt the greatest, it really depends what its pointing at reflectively, but I have ranged past 600M , and when it works , its pretty quick, and there is a constant scanning mode.
The battery has never run out on me , its been on for longer than its claimed 6 hours, and even when the icon is empty and flashing red, its never shut down.
Initially , like Ian says , it seemed harsh on my eyes, even on low brightness, there is a fair bit of difference between Pulsars blue colour palette , and Irays grey/brown, I will say I prefer Irays, and after a few outings , the 'glare' didnt bother me any more.
The zoom function goes up in .5 increments, but like all thermals , is digital , and only degrades the image, and this I would say , is the fundamental difference between the Finder and say, an XM or XQ 38, that 2.5 or 3.5 base zoom on the Pulsars gives them a grainy effect that you might think is perfectly OK , until you look through the Finder, one of my perms I can see clearly across a wooded hillside nearly a kilometre across, and have tracked fox, badger and muntjac all the way across to me, I can see cows and sheep at least a mile away, and field mice over a 100 M away.
When I bought it from Mr Ray, I trialled every Xeye he had

(I originally went there to buy an E3max) but to my eyes the Finder was the better thing, even with its puny 25 mm lens.
Yes , an Accolade is better, but they also cost 4 grand, but I paid less than 2 for my FH25 brand new
Would I buy it again , yes , if they bought a newer model out, yes again.