Works well. I find it better than thermal because you see much more detail, I use a thermal hand-held to find critters and the night-vision for a detailed view.
You MUST also purchase the IR torch, works fine on it's own with a full moon but in other conditions the IR torch is a must. Regardless of the moon, with the IR torch I can see plenty of detail, enough to take shots as far as I consider practical with a spotlight.

Absolute rippa unit, also great help from the staff on what I needed, will continue to buy from here.

I took the alpex 4K A40EL out in the field for a run.
For an old bloke it takes a lot of patience and a few missteps to get it right.
Connecting the phone app requires some mental gymnastics but is doable.
Once I got it sighted in, (easy) and got the ballistic calculation right ( less easy) it was a joy to shoot.
In daylight at the base refresh rate and rimfire ranges it’s great. Good colour and detail. The boot for the ocular is required during the day to prevent reflections, it takes getting used to.
At dusk it’s pretty good to about 60m in low light up to light levels that would prevent the use of a normal 3 - 9 x 40 scope.
It does get grainy and it requires a bit more tuning with settings to get the most out of it. It is limited by the size of the objective.
At night (I removed the boot) with no moon and a spotlight or a light with filters, it’s fine to rimfire ranges clear enough for target identification.
The automatic brightness and colour to b&w is intrusive and I found it was best turned off and tuned to the light source.
I haven't tried it under full moon conditions but using an IR torch, the torch is the limitation. I was using a borrowed torch as I wasn’t sold that this was the solution for me. The torch I had was good for 40 meters and wasn’t giving me issues with glare which I believe can be an issue. I had no problems head shooting rabbits within the visible range I had, I could see the reflection of eyes further out but was battling to properly identify the targets.
I now feel confident enough to spend the money on a decent IR torch to extend my range at night.
I think these are a great solution for anything up to a .22 Hornet; if you don’t mind figuring out what settings suit your application.
For a .22 rimfire with subsonics I appreciate the advantages of the range finder and ballistic calculator.
Really the only problem I have is I am going to need a thermal spotter to make the most of it.

Dear [Seller’s Name],
I need to correct the review I left.
I was fully aware that the eyepiece I purchased was designed for a different model and would not fit my scope. The incompatibility is entirely my mistake, not yours. The part itself is very well made and of excellent quality.
Unfortunately, when leaving feedback on my phone, I accidentally selected a one-star rating instead of five stars. I buy a lot on eBay, and the five-star option sits on the far right side of the screen. Due to how it was displayed on my phone, I only saw part of the star row and mistakenly tapped the wrong side.
I absolutely did not intend to leave a one-star rating. Your service has always been outstanding, and you are without question the best thermal product supplier I have ever dealt with.
Please accept my sincere apologies for the incorrect rating.

Scope is roughly the same size as the 3-9 x 40 I took off.
It’s taking some fan dangling to mount it far back enough on my CZ to be comfortable, using standard mounts. It’s pretty close to being comfortable. The bolt handle just clears the scope with medium mounts.
The controls are intuitive enough and the range finder seems to work well.

I feel it’s a good option for my rimfire.
Scope is clear enough but I am yet to finish
sighting it in and use it for real. No regrets so far.