I've tested them all a lot..
Thermtec, Senopex, Pulsar, HikMicro, iRay , etc
I was out last night with a Thunder 2.0 TQ50 and a Thermion 2 XG50
All the 12 micron chinese brands use big amount of denoise filters to smooth out the image, whilst leaving grain actually adds detail to the full scene.
I tested Senopex against Thermtec, some of the Thermtec offerings they are clearing are cheap and a good price, although the Senopex definitely spanks them without question..
I kept a Thermion 2 XG50 LRF myself, because the target ID and detail at range for a 50mm unit is the best in it's class 640x480, 12 micron, 50mm focal, others with similar spec didn't retain the same detail, especially throughout the mag range when using Digital zoom. The standard model of these have just been released and there priced very well at £3500.
The Thunder 2.0 TQ50 is a nice compact unit, the initial firmware scared me away from them, but a firmware update improved things a lot, I must admit the Pulsar has an overall more natural image but the Thunder is priced very cheap and its tiny if you want to keep weight down.. I've been using one on my bullpup to keep the weight right down.
IF it was me and I had to choose a thermal scope currently for my own needs, wide field of view, decent image and multi functional as in close/long range.... just purely thermal it would be
Thermion 2 XG50 LRF
Senopex S7
Thunder 2 TQ50 2.0
IF I wanted the best poor weather performance it would be
Thermion 2 XP50 PRO
Thermion 2 XQ50 PRO (Bargain)
Thunder 2 TQ50 2.0
If I wanted the best long range foxing scope it would be
Senopex S10
Senopex S7
Senopex A7
Thermion 2 XG50
Thermtec Ares 660
If I wanted a really good day time 4K scope and stunning thermal image upto medium ranges and excellent poor weather performance.
Thermion Duo DXP55